[BUG] Using fe_group value (-2 == show if fe_user is logged in) in page propertie logs BE user out

[magicHatOfTYPO3]

Describe the bug

As soon ext:solr is installed and enabled in the TYPO3 system, the TYPO3 core functionality breaks. After saving a page record with fe_group value "-2" (show page if FE user is logged in, no matter which fe_group the user belongs) the BE user is logged out and have to start over. This also happens on subpages when a parent page has this setting and "extendToSubpages" is set true.

This does not happen, if ext:solr is removed from the system.

To Reproduce

1. Create new page
2. Goto page properties
3. Go to tab access and use "show if fe user is logged in" in the field fe_group
4. Click save
5. You are now logged out.

Expected behavior

I expect the BE user is still logged in (as it happens if you choose a fe_user group in the named select field).

Used versions (please complete the following information):

• TYPO3 Version: 11.5.16
• Browser: chrome, firefox
• EXT:solr Version: 11.5.0
• Used Apache Solr Version: 8.11.1 (Docker solr:8.11.1)
• PHP Version: 8.0
• MySQL Version: MariaDB 10.3

[dkd-kaehm]

Relates: #3246

[dkd-kaehm]

@magicHatOfTYPO3 Thanks for reporting that issue. The kick of BE-User happens because of mentioned in #3246 core feature "$GLOBALS['SYS']['features']['subrequestPageErrors']". Please don't use it currently together with "EXT:solr".

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The main bug is that the TSFE can not be initialized for pages with fe_group=-2. I'll close this issue and open a new one.