Strange Webhook behaviour in Google Forms

What are you trying to achieve?

Dear Community,
i successfully setuup a webhook in google Form.
The URL works - i can see data coming in in make > Webhooks.
When running the script in google i can also see that data arrives in Make,
BUT - when setup a trigger in google and run the actual for - the trigger runs into an error.

Would anyone have an idea where the issue may be?
Cheers Seb

Screenshots: scenario setup, module configuration, errors