iOS Shortcut - device unreachable stops shortcut running

I have a go to bed shortcut that does various things when we go to bed. I have one ‘section’ that occasionally causes the shortcut to stop. The issue is caused by a Netatmo HomeKit radiator valve(s) that become unreachable. When the shortcut tries to change the temperature setpoint for the valve, if it is unreachable the shortcut fails.

Ideally the shortcut would let me know there was an issue with a valve but continue with the remainder of the shortcut.

since there is no error handling I am a bit stuck. I have seen a possible solution use x call back but TBH have no idea how to use that.

I have modes the temp setting to the end of the shortcut so any effects of an unreachable device are minimised, but it can still be a pain.

Any ideas appreciated.