Blackberry Calendar bug: time zone alert upon network switch

The Blackberry Hub+ Calendar app currently (version has a bug where the WWAN carrier switching (e.g. Sprint to T-mobile or vice versa) triggers a time zone change alert. This can happen several times an hour in particular locations, say a thick metal building with Sprint and T-mobile towers at opposite ends. Walking from one side of the building to the other can trigger a switch from Sprint to T-mobile–with this bugged Blackberry Calendar app, each switch triggers a time zone change alert.

Android 7.1 notification for Blackberry Calendar
Blackberry Calendar timezone change alert happens up to multiple times per hour.

Phones on aggregating MVNOs like Project Fi and Republic Wireless may be subject to this Blackberry Calendar bug.