Describe the bug
EXT:solr's RecordMonitor is throwing an exception for pages with extentToSubpages=1 when toggling from hidden=1 to hidden=0 and having a subpage with an unpublished draft version.

To Reproduce
Steps to reproduce the behavior:

1. Set a page X to hidden=1 and extendToSubpages=1
2. Edit one of its subpages in WS module, don't publish though.
3. Change page X in live workspace to hidden=0
4. See error

Expected behavior

No exception obviously ;-)

Screenshots

Used versions:

• TYPO3 Version: 11.5
• EXT:solr Version: 11.5.6
• PHP Version: 8.1