Under the hood
Useful1 Signal2
Plugin interfaces being held back no longer show up as available in debug output.
What's wrong with this entry?
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What
The engine debug summary of available interfaces now filters out ones marked as withheld, not just core-owned ones, so a plugin interface that is being held back is not reported as available.
Evidence
engine.create:
Strings lifted out of the shipped bundle, so the claim above can be checked against them.