TYPO3 Core

I just tried to sort about 160 pages in the backend (Page tree > context menu > sort subpages) and got a fatal error:
"Allowed memory size of 268435456 bytes exhausted (tried to allocate 20480 bytes) in /var/html/t3xxx/web/typo3/sysext/core/Classes/Utility/ArrayUtility.php on line 201"

Unfortunately there is no error stack trace, as the script just exits.

Some of the page titles are quite long (150+ characters, with URLs sometimes over 200 characters long). But apparently 256M - as recommended by TYPO3 11 - isn't enough, or is there a possible memory leak? Sorting with a php_memory_limit of 512M works, though...

I've also tried to sort by the other options. Only sorting by crdate was possible (but not reversed sorting). Interestingly, sorting by tstamp was unsuccessful, even if it's the same type as crdate.

I have attached a file containing the pages I wanted to sort by page title. Most of them are sorted already, but the editors inserted some pages at the top which should be moved further down the list.

The only other active extension I could think of that maybe has an influence on this is the sluggi extension. But even after uninstalling it the error still occurs.

TYPO3 version is 11.5.26.