Shared calendar entries not showing anymore

[Woipi]

If I open a shared calendar from another user, it works perfectly for the first time. When I deselect the calendar it is correctly not showing anymore. When I select the calendar again, the entries are shown for around 1-2 seconds and then every entry disappears and won't show again (regardless if it is deselected and selected again or Thunderbird is restarted) until the next day.

[Shamp0o]

Same issue here. Also happens if I invite attendees for an event. Zooming in and out sometimes makes it persistent but it usually takes quite a few tries.