Found in Version 11.3.3.0
Resolved on 7/22/2022. (Release Version: WebReports 11.3.4.0)

Bug: When editing a UDF and you use the Search feature the changes do not stick. In the screenshot below, I removed the 'Test' value and then searched for Department. After doing this the 'Test' value was back in the UDF.

Repro Steps:

1. Make changes to the value for a UDF
2. Click into the search area
3. Search for the field you modified the value on and press enter