diff --git a/tests/robustness/goldens.json b/tests/robustness/goldens.json
index 2eb4bf04..c03160f4 100644
--- a/tests/robustness/goldens.json
+++ b/tests/robustness/goldens.json
@@ -14,7 +14,7 @@
   "10": {"area":2809.248846,"bodies":1,"edges":39,"error":null,"faces":16,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut box","fillet","hole"],"unsupported":0,"volume":6696.329905},
   "11": {"area":7858.300481,"bodies":1,"edges":33,"error":null,"faces":13,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","hole","rectangular pattern","fillet"],"unsupported":0,"volume":34605.048259},
   "12": {"area":4668.664174,"bodies":2,"edges":59,"error":null,"faces":25,"outcome":"ok","rejected":0,"shells":2,"steps":["extruded profile","chamfer","join cylinder","join box","cut cylinder","circular pattern"],"unsupported":3,"volume":11874.471611},
-  "13": {"area":2101.521015,"bodies":1,"edges":103,"error":null,"faces":41,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut cylinder","join box","rectangular pattern","cut cylinder","cut box","fillet","hole"],"unsupported":0,"volume":2396.939546},
+  "13": {"area":2112.846954,"bodies":1,"edges":99,"error":null,"faces":39,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut cylinder","join box","rectangular pattern","cut cylinder","cut box","fillet","hole"],"unsupported":0,"volume":2410.783741},
   "14": {"area":10553.267409,"bodies":1,"edges":43,"error":null,"faces":20,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","cut cylinder","shell","fillet"],"unsupported":0,"volume":10369.008764},
   "15": {"area":2312.730168,"bodies":1,"edges":39,"error":null,"faces":15,"outcome":"ok","rejected":2,"shells":1,"steps":["revolved section","cut box","rectangular pattern","cut sphere","cut cylinder","cut sphere","join cylinder"],"unsupported":0,"volume":5728.661237},
   "16": {"area":8872.873884,"bodies":3,"edges":49,"error":null,"faces":23,"outcome":"ok","rejected":0,"shells":3,"steps":["box","join cylinder","circular pattern","hole"],"unsupported":0,"volume":44953.403148},
@@ -68,7 +68,7 @@
   "64": {"area":4088.335645,"bodies":1,"edges":36,"error":null,"faces":14,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","fillet","join cylinder"],"unsupported":0,"volume":8495.220295},
   "65": {"area":8436.255548,"bodies":1,"edges":37,"error":null,"faces":15,"outcome":"ok","rejected":0,"shells":1,"steps":["box","cut cylinder","fillet","rectangular pattern","circular pattern","circular pattern","fillet","cut box"],"unsupported":0,"volume":45143.475817},
   "66": {"area":9222.76638,"bodies":1,"edges":99,"error":null,"faces":37,"outcome":"ok","rejected":0,"shells":1,"steps":["extruded profile","join box","join box","join box","cut sphere","cut box"],"unsupported":1,"volume":35217.203139},
-  "67": {"area":7943.46222,"bodies":2,"edges":88,"error":null,"faces":37,"outcome":"ok","rejected":0,"shells":2,"steps":["extruded profile","cut cylinder","hole","join cylinder","join box","hole","chamfer","rectangular pattern"],"unsupported":2,"volume":27607.962186},
+  "67": {"area":7943.462219,"bodies":2,"edges":86,"error":null,"faces":36,"outcome":"ok","rejected":0,"shells":2,"steps":["extruded profile","cut cylinder","hole","join cylinder","join box","hole","chamfer","rectangular pattern"],"unsupported":2,"volume":27607.962204},
   "68": {"area":7338.675126,"bodies":1,"edges":36,"error":null,"faces":14,"outcome":"ok","rejected":2,"shells":1,"steps":["extruded profile","hole","hole","rectangular pattern","rectangular pattern","fillet","circular pattern"],"unsupported":0,"volume":29780.741772},
   "69": {"area":6451.122767,"bodies":1,"edges":60,"error":"offset: a corner whose faces don't meet the same way after t","faces":27,"outcome":"failed","rejected":0,"shells":3,"steps":["revolved section","join box","shell","shell"],"unsupported":0,"volume":4761.477515},
   "70": {"area":3682.669157,"bodies":1,"edges":24,"error":"lumps: shell boundaries intersect or touch; cavity ownership","faces":12,"outcome":"failed","rejected":0,"shells":2,"steps":["extruded profile","join box","hole"],"unsupported":1,"volume":9155.027162},
@@ -95,7 +95,7 @@
   "91": {"area":3958.046518,"bodies":1,"edges":50,"error":null,"faces":20,"outcome":"ok","rejected":1,"shells":1,"steps":["revolved section","cut cylinder","fillet"],"unsupported":0,"volume":9721.244548},
   "92": {"area":2855.139217,"bodies":1,"edges":30,"error":null,"faces":12,"outcome":"ok","rejected":0,"shells":1,"steps":["revolved section","chamfer","cut sphere"],"unsupported":0,"volume":9814.30292},
   "93": {"area":7266.404017,"bodies":7,"edges":111,"error":null,"faces":51,"outcome":"ok","rejected":0,"shells":7,"steps":["extruded profile","fillet","chamfer","join box","circular pattern","rectangular pattern","cut cylinder"],"unsupported":0,"volume":12734.393171},
-  "94": {"area":3480.70333,"bodies":1,"edges":61,"error":null,"faces":26,"outcome":"ok","rejected":1,"shells":2,"steps":["revolved section","cut cylinder","fillet","hole","rectangular pattern","cut box","cut box"],"unsupported":0,"volume":5456.446856},
+  "94": {"area":3480.70333,"bodies":1,"edges":63,"error":null,"faces":27,"outcome":"ok","rejected":1,"shells":2,"steps":["revolved section","cut cylinder","fillet","hole","rectangular pattern","cut box","cut box"],"unsupported":0,"volume":5456.446856},
   "95": {"area":2375.340299,"bodies":1,"edges":33,"error":null,"faces":12,"outcome":"ok","rejected":2,"shells":1,"steps":["revolved section","hole","cut cylinder","cut sphere","circular pattern","cut sphere"],"unsupported":1,"volume":6704.220611}
  },
  "platforms": {"windows":{"seeds":{"1":{"area":2642.450837,"bodies":1,"edges":32,"error":null,"faces":13,"outcome":"ok","rejected":0,"shells":1,"steps":["revolved section","cut cylinder","join cylinder"],"unsupported":0,"volume":6991.569339},"23":{"area":1795.696636,"bodies":1,"edges":15,"error":null,"faces":7,"outcome":"ok","rejected":0,"shells":1,"steps":["revolved section","cut sphere"],"unsupported":0,"volume":3198.694618},"34":{"area":1086.303608,"bodies":1,"edges":30,"error":null,"faces":14,"outcome":"ok","rejected":0,"shells":1,"steps":["revolved section","cut sphere","hole"],"unsupported":0,"volume":2134.3653},"67":{"area":7943.46222,"bodies":2,"edges":86,"error":null,"faces":36,"outcome":"ok","rejected":0,"shells":2,"steps":["extruded profile","cut cylinder","hole","join cylinder","join box","hole","chamfer","rectangular pattern"],"unsupported":2,"volume":27607.962186},"94":{"area":3470.837042,"bodies":1,"edges":63,"error":null,"faces":27,"outcome":"ok","rejected":1,"shells":2,"steps":["revolved section","cut cylinder","fillet","hole","rectangular pattern","cut box","cut box"],"unsupported":0,"volume":5456.438772}}}},
@@ -137,7 +137,8 @@
   {"reason":"#1670 and #1753 (mesh export: twisted ruled faces divided to the chord tolerance, and the faces of an edge sharing its points exactly) change the meshes the kernel's validity and volume checks measure: seed 55's body (a filleted box cut by spheres and patterned) now passes the validity check it failed, and its volume moves by 1.3e-5 relative. Pull requests ran only every 8th seed, so main's full run found it. Recorded from main's CI output (Linux).","seeds":[55]},
   {"reason":"#853 recorded seeds 13, 71 and 94 as its own branch built them (13: 40 faces/101 edges, 71: 19/50, 94: 27/63), but with main's kernel they build as before (41/103, 20/52, 26/61), so every full run on main failed on them after #853 landed. This puts back the counts main builds; #853's conical-cut refinement (seed 20) is unchanged. Steps, outcomes, volumes and areas are the same.","seeds":[13,71,94]},
   {"reason":"#1853 (a part revolve of a profile with an edge on the axis is swept a third of a turn at most per face, so the boolean can intersect its faces): seeds 28 and 95 start with a rectangle on the axis turned half a turn, now two quarter turns. Seed 28 (joined by a cylinder) has more faces for the same shape (5902.1214 -> 5902.1117 mm3, the new faces' meshes). Seed 95's hole into it failed with 'boolean Cut: no result' on the half-turn faces and now builds, so the generator's later picks move. Values from Linux CI.","seeds":[28,95]},
-  {"reason":"Independently reproduced on unmodified main 1e984c8e on Windows; the extrusion branch produces the same values. Shared references and tolerances remain unchanged.","platform":"windows","seeds":[1,23,34,67]},
-  {"reason":"Seed 94 independently reproduced on unmodified main c5992386 on Windows after the extrusion rebase: the same steps, outcome and geometry values as the rebased branch. Shared references and tolerances remain unchanged.","platform":"windows","seeds":[94]}
+  {"platform":"windows","reason":"Independently reproduced on unmodified main 1e984c8e on Windows; the extrusion branch produces the same values. Shared references and tolerances remain unchanged.","seeds":[1,23,34,67]},
+  {"platform":"windows","reason":"Seed 94 independently reproduced on unmodified main c5992386 on Windows after the extrusion rebase: the same steps, outcome and geometry values as the rebased branch. Shared references and tolerances remain unchanged.","seeds":[94]},
+  {"reason":"#2064 (multi-profile extrusion) merges coplanar faces the boolean used to leave split. Seed 67 has one face/two edges fewer from its first cut on, at the same volume at every step; seed 94's last box cut leaves one face/two edges more, same volume and area. Seed 13's second cylinder cut leaves 35 faces/84 edges instead of 37/88 at the same volume, so its random fillet (edges picked by index) rounds different edges: 2688.99 instead of 2675.18 mm3 after the fillet; the hole after it removes the same 278.2 mm3. Every step passes the validity and volume-direction checks. Pull request CI ran only every 8th seed, so main was the first run to see these.","seeds":[13,67,94]}
  ]
 }