Downtimes postponed

CMK version: 2.0.0p22 CEE
OS version: Appliance

Error message:

Since the time change in the Night of the 27th of March, my Downtimes are postponed by one hour.

The time on the Monitoring Host is the correct one.

Does anybody experience the same issue?
(Created an official Support Ticket)

Output of “cmk --debug -vvn hostname”: (If it is a problem with checks or plugins)