TYPO3 Core

I updated from 8.7 to 9.5.10

Aufter Upgrade process I cannot login to the backend.
I found https://forge.typo3.org/issues/87903 which seems to be solved.
But I have the same issue.

if I call: myweb.test/typo3/index.php?route=%2Fmain&token=f6c339900d995abb8256d799fc15652c56e8b562

In line 732 $parsedUrl is:

array (size=2)
  'path' => string '/typ/typo3/alt_doc.php' (length=22)
  'query' => string '&returnUrl=/typ/typo3/index.php?&M=web_layout&id=43&edit[tt_content][1]=edit&defVals=&overrideVals=&columnsOnly=&returnNewPageId=&editRegularContentFromId=&disHelp=&noView=&SET[showPalettes]=&SET[showDescriptions]=&SET[disableRTE]='

in line $parsedReturnUrl is:

array (size=1)
  'path' => string '/typ/typo3/index.php'

therefore $parsedReturnUrl['query'] is null