If re-define the macro USE_CIRCULAR_DEPENDENCY_LOAD_DEFERRING to 0, the component is editable in detail panel. But I'm sure it's not a good fix.
Result: Detail panel of skeletal mesh component is empty, and log shows:
PLACEHOLDER-CLASS_XXXX is not a legal override for component XXXXX
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-157052 in the post.
|Component||UE - Gameplay - Blueprint Editor|
|Target Fix||5.2, 5.1|
|Created||Jun 19, 2022|
|Resolved||Mar 20, 2023|
|Updated||Mar 21, 2023|