Breaking: #61823 - Remove magic setter for $fromTC

See Issue #61823

Description

The magic setter for $fromTC in TYPO3CMSCoreDatabaseRelationHandler is removed.

Impact

Directly setting the protected property $fromTC will trigger a PHP warning.

Affected installations

Any installation using an extension that sets $fromTC property directly.

Migration

Use \TYPO3\CMS\Core\Database\RelationHandler::setFetchAllFields() instead.