MailApproval and Form field validation on path

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Hi Guys,

I use MailApproval on some paths in our application. Now I have the somewhat unusual behavior that an acceptance via MailApproval is rejected with a validation error. If I carry out the acceptance in the same process (same instance) in the application, it works.
The option “Form field validation” is checked on the paths. If i deselect, it works.

This is what MailApproval returns:
#################
Path transition operation failed:
Operation on element: DEV/WAVE/2024/556 failed. Error: The following path was selected: Freigabe erteilt, weiterleiten an BL. {Name of the path in german}
Status: Document not moved to next step.
Details: Validation error
#################

Does anyone have a spontaneous idea why this runs into an error via MailApproval and not in the application?

Thanks in advance!