Hi, thanks for reporting this issue!
Just to clarify, is this issue occurring with flex features enabled or disabled? Flex would be enabled if you have a UIListLayout with Wraps=true, or HorizontalFlex/VerticalFlex!=None, or you are using any UIFlexItems.
Also is this bug causing an issue in a live game? If so, I can turn off flex layout for the game if you would like.
Here is a post on how to get bug reporting access, have you tried following these steps already? The Big Bug Reporting Update
I’ll send you a DM to get some more info!