Hello [mention removed]
Thank you for reporting this issue.
I have some good news: While testing this against every UE5 version, I noticed that they fixed it in the main branch of Perforce (5.6).
Immediately after creating the EditorUtilityBlueprint from an EditorValidatorBase and saving, we can see the BP registered as an Enabled Validator:
[Image Removed]This issue will be fixed in the next release!
All the best,
[mention removed]