cf_extbase_datamapfactory_datamap Enties are generated wrong after expiring
In the Table cf_extbase_datamapfactory_datamap there is an Entry for the Identifier: "TYPO3%CMS%Extbase%Domain%Model%Category". When it is newly generated is has a content size of 32,1 KB.
When this Entry gets expired it will be newly generated. But after that it has a content size of 734 Bytes and all DataMap Information about the mapped Table are gone. This results in an error message "#1247602160: Table 'tx_extbase_domain_model_category' doesn't exist" and the Frontend is not accessible.
To reproduce this you can use a Model of Type \TYPO3\CMS\Extbase\Domain\Model\Category and use it in some Controller. After the first Request you can go to your Database and change the "expires" Field of the Entry with Identifier: "TYPO3%CMS%Extbase%Domain%Model%Category" to a lower value or just delete this Entry.
I guess this issue is related to #75399.