Changing the incident priority in the incident channel doesn't post any updates in the channel that the incident was raised

[benilovj]

How to reproduce

1. There is an existing incident that's at P2, say, that's been raised in an existing channel.
2. I use the /incident update command in the incident channel (incident_...) to change its priority to P1. The bot correctly posts an update in the incident channel.

Expected: The bot posts an update of the incident priority in the existing channel.
Actual: no update is posted.