You can view/track/add issues @ iCalCalendar github.
The changelog has this entry, seems to be related
- 0.14.2
26 feb. 2022
Bugfixes: Recurring events starting at 00:00 was misread
And 0:00h UTC = 02:00h Dutch local (summer)time, so it looks like a similar issue.
About v7.4.0-rc firmware:
iCalCalendar seems to run fine on it:
