issue is still present on unreal 5.0.3, same steps to reproduce as mentioned in report UE-43408
the way for this issue not to happen and break a lot of stuff is to close the unreal editor, compile the code with the changes using VS or the tool of your preference, and then reopen the editor to see the changes…
it’s really sad to have to open and close the unreal editor just because you wanted a new member in the struct, for large projects this could be a big time waster