OK. It’s about time I punt this out there to see if it is just me before raising it.
I started out 4-5 years ago on a Fossil Gen 6 and moved to the GW6 as it was WearOs 5 OoB and so Facer compliant.
In all that time, whenever I set a timer, and it went off and I swiped X to cancel, the Facer face would just freeze for minutes.
Since last watch update it just hangs for at least 15 minutes without interaction before crashing and restarting, but you can fiddle with the watch to crash and restart the face sooner.
For my use case I use the long press top to speak to the assistant to set a timer, triggering the watch internal timer (Bottom icon) and swipe the red X on the white circle to exit.
If others experience this I can point at this thread when I raise the issue.