I just had some similar issue where I thought Set Text wasn’t working.
Turned out my List View which has objects that ref its parent had a stale parent.
Since I destroy and recreate their parent in my case I had to refresh their parent to restore the history of data I used the list for.
I do not believe I got any errors or warnings about the stale parent, it was there just new and the object had an old pointer but again no errors so it seemed strange but makes sense once caught.