Sorry for my late response.
It always happens when I want create a new post. I also have this problem when I want to create a new Fire brigade report with the plugin ‘Einsatzverwaltung’. But the existing posts are also affected.
Unfortunately I can’t tell you which plugin causes the otw_tsw problem.
The latest plugin version is installed (?8.9.02.005?)
What exactly do you mean with wppa blocks?
Kind regards