No Heartrate in walking activity after update this morning

Im on holiday and was using the "Gehen" (Walking) activity to track wicy tracks I'm going. This morning the watch received an update, and now walking no longer records the Heartrate. Running still does. The general Heartrate tracking is also still working but has empty gaps at the time where I was using walking activity. 

This is pretty annoying. Restarting watch twice didn't help either.

Also this is the third time an update is installed that reports 12.70  wtf Garmin, this is clearly different from the previous 12.70 that was not broken