Under the hood
Plugin hooks loader can now hold an entire 'user tier' of hooks after a prior failure
What
The loader for plugin function-hooks (custom code plugins can run at certain points) now checks each module's tier field. If a previous failure has marked a tier as "held," any module still loading with a "user" tier is skipped entirely rather than going through the normal load process, and it is logged as "not loaded: the user tier is held."
Why
This stops an entire tier of user-level plugin hooks from continuing to load after something in that tier has already failed, rather than letting each module fail individually.