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I've tried a fresh installation on PHP 8.5.1 and it worked for me.
Can you try to install a fresh installation on your system to see if there is a difference?
Also, in your preferences, did you set it to "Check templates for modifications" ?
Finally, did you use the latest code on GitHub, since there were some changes since the releases of Beta 9, or just the original Beta 9 release?
That would help me to try to replicate the issue.