A reference's layer 0 and Defpoints are not dependent symbols: its
objects on them use the host's layers of those names, which are made
from the reference's only when the host has none. Before, they became
XREF|0 / XREF|Defpoints on load and XREF$0$0 on bind.
Co-Authored-By: Claude Opus 5.5 <[email protected]>