Typo3 9.5.28 crashes CoolURI

[ut]

After a minor security update of Typo3 9.5.28, all pages of a website were not reachable any more via a CoolURI URL.

Error message:

Page Not Found 
The page did not exist or was inaccessible. 
Reason:
Request parameters could not be validated (&cHash comparison failed)

Cache deletion didn't help, even resetting the CoolURI Chache.

Hot fix: Reverting the Typo3 Update solved instantly this issue.

[bednee]

There was a problem in handling query parameters, can you please try current master? I've just pushed a possible fix. This cHash validation can be turned off in TYPO3 configuration.

[ut]

Cool, I'll try and give you feedback.

[ut]

The update gives the same error (both after installation and plus after "Delete everything and start again"

[A-Kalkhoff]

Error persists in the recent 9.5.29

[ut]

We can confirm.