Seems that only the Add Asset Class search option works properly.
Tested in 4.19.2 (CL - 4033788), 4.20.1 (CL - 4233996), and 4.21 (CL - 4280116)
Expected: Both of these search options should produce the PrimaryAssetLabel_BP Blueprint in its search results
Results: Only the Add Asset Class button only works as intended
How does TextureRenderTarget2D get TArray<uint8> type data?
Why does the REMOVE method of map container remove elements have memory leaks?
How to delete some elements correctly when deleting an array loop?
How do I set a material as a post-processing material?
UMG RichText not appear image when packaged
What is the cause of the packaging error falling back to 'GameUserSettings' in ue5?
What is the difference between Camera and CineCamera?
How does TArray loop correctly remove elements in blueprints?
There's no existing public thread on this issue, so head over to Questions & Answers just mention UE-62872 in the post.