[TYPO3-calendar] Massive Bug cal 2.0.0 with TYPO3 9.5: external calendars doesn't work any longer

[Markus]

Hello,

after upgrading from TYPO3 8.7 to 9.5 and cal 1.11 to 2.0.0 our 
installation isn't working any longer: it is no longer possible to save 
an external calendar URL: the URL is not saved anymore and no calendar 
events from external calendar are created anymore....

Is there any solution for this bug?

cal is really buggy in the meantime and not compatible with TYPO3 9.5...

Thanks,

markus