Good afternoon Steffen and welcome to the Events Calendar Support forum!
Thank you for reaching out to us.
We apologize for the inconvenience caused by this glitch impacting the comments availability.
We are actively working on a fix for this.
Unfortunately, I cannot commit to a release date for a fix at this point.
But you will be contacted as soon as there is one.
In the meantime, the workaround is to downgrade Community Events to 4.3.2.
To do that, you can read: https://theeventscalendar.com/knowledgebase/downgrading-plugin-past-version/
Thank you for your patience as we see this through.
Best regards,
Geoff B.