TYPO3 Exception 1581862822¶

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This error might be caused by inserting content into a Fluid template by

If the TypoScript object uses a insertData = 1 or the datawrap curly braces might get parsed, see https://docs.typo3.org/m/typo3/reference-typoscript/main/en-us/Functions/Stdwrap.html?highlight=insertdata.

So, the serialized value of the hidden form field tx_form_formframework[__trustedProperties] get's parsed, too. The following HMAC validation throws the exception, because the __trustedProperties is broken.