It happens when saving a form made in TYPO3 8.7.1. When saving, or when try to
unhide that content element I get the error.
So I made a new form in TYPO3 8.7.2. then there are no errors, not by saving, nor by un-hide.
I had 6 forms made in TYPO3 8.7.1 and all 6 had the same error.
I think it has to do with forms made in TYPO3 8.7.1
I make new forms.
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