Unexpected "Event notifications" every 6min that disappears after 1s

• /e/ version: e-0.12-q-2020110282350-dev-FP3
• Device model(s): FP3

Summary

Every 6min there is a notification with text "Event notifications" and a calendar icon that automatically disappears after 1s. I don't have any events in my calendar that would trigger a notification.

The problem

Steps to reproduce

Simply wait (so far 6min)

What is the current behavior?

A notification comes up and disappears after a second.

What is the expected correct behavior?

That notification should not appear.

Technical informations

Relevant logs (adb logcat)

Relevant screenshots

Solutions

Workaround

I haven't found a way to suppress that notification.

Possible fixes