Hi there @Achim-and-Shubha0 ,
Thanks for reporting this issue and sorry to hear you are experiencing it! As @Sarah977 mentioned, it has been reported by other hosts and the team are currently working on a fix. In the meantime, there is a work around you can try to get things functioning:
Go to account settings, enable Professional tools, and then refresh the calendar. After this, you should be able to click on the dates in question on the calendar, and in the right side panel, the rule-set will be there if you scroll down.
Let me know how you get on!
Thanks,
Stephanie