When trying to edit the expression of a text field, the editor can't be opened. When editing it via properties -> advanced -> expression the content, which is already set, gets deleted and nothing new can be set.
Suppose this is the error:
!ENTRY org.eclipse.ui 4 0 2022-06-27 16:51:55.424
!MESSAGE Unhandled event loop exception
Tte log file is in the attachements.