Hi there,
I have the same issue but couldn't solve it by using your hints.
My situation:
I have a normal issue task which worked for a while. Lately, I added the field for time tracking and assigned a person in the project the project administration.
What happened was, that suddenly this message came up and also, the field "label" showed up, altough it was not there before.
Thanks for you answer!
Let me know if I need to further clarify!
Christian