Join Button missing after Upgrade to 6.5.5

Hello everyone,

after an upgrade to Zoom Room 6.5.5 (7566) we are no longer able to join the meeting via the calendar integration.

I have another appliance on Version 6.4.5 (6950) which works perfectly fine. Calendar permissions are identical and I could replicate this behavior with another device.

Does anyone know what changed with version 6.5.5?

Thanks!