The Asset Audit search options do not work as intended

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)

1. Download and open the attached project
2. Right click the PrimaryAssetLabel_BP Blueprint and select Audit Assets
3. Click the Clear Assets button
4. Select Add Primary Asset Type and select abcdefg
5. Clear Assets again
6. Select Add Asset Class and chose MyPrimaryAssetLabel

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