TYPO3 Core

Hello,

After the upgrade to TYPO3 v12 we started receiwing following error after property mapping back to the object from the f:form:

Exception while property mapping at property path "idea": The identity property "16901_16902" is no UID.

It looks it changed in the core https://github.com/TYPO3/typo3/blob/v12.4.22/typo3/sysext/extbase/Classes/Persistence/Generic/Mapper/DataMapper.php#L137
Following piece of code cause the error: https://github.com/TYPO3/typo3/blob/v12.4.22/typo3/sysext/extbase/Classes/Property/TypeConverter/PersistentObjectConverter.php#L228

Combined identifier is created by Form VH from here: https://github.com/TYPO3/typo3/blob/v12.4.22/typo3/sysext/fluid/Classes/ViewHelpers/Form/AbstractFormFieldViewHelper.php#L198

So any form input like this:

<f:form.hidden value="{idea}" property="idea" />

results in this:

<input type="hidden" name="tx_ext_plugin[idea][__identity]" value="16901_16902">

same goes for checkboxes, etc ...

In the default language, it's ok, the problem is only for localized records