TYPO3 Core

Correction, I meant "Security: frontend enforce content security policy"

I have not tested it but it may be the same error as in https://forge.typo3.org/issues/102438 You can either test if the corresponding patch works or if nonce="{f:security.nonce()}" works for as a workaround.

Michael Binder wrote in #note-2:

I have not tested it but it may be the same error as in https://forge.typo3.org/issues/102438 You can either test if the corresponding patch works or if nonce="{f:security.nonce()}" works for as a workaround.

Thanks, yes, both the patch and the workaround work and the scripts and CSS are effective again.
Only the back button of the form …
<button formnovalidate="formnovalidate" class="btn btn-cancel" onclick="document.forms['contactform-55'].submit();" type="button" name="" value="">back</button>
… does not yet work due to the onclick.

Patch set 2 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81878

Patch set 3 for branch main of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81878

Patch set 1 for branch 12.4 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81960

Patch set 2 for branch 12.4 of project Packages/TYPO3.CMS has been pushed to the review server.
It is available at https://review.typo3.org/c/Packages/TYPO3.CMS/+/81960