Apple Watch Always On is overridden by Theatre Mode

Hi all as an excited owner of a Gen-5 Apple Watch I was frustrated to discover at some point always on stopped working. In fact no matter what I did, I had to tap to activate the display.

Then I noticed that there was a little "happy/sad" icon on my watch face. I didn't know what it was but searched for that and found that it's "theatre mode". Apple Watch Theatre Mode overrides Always On. If you have small kids like me, this can be accidentally activated. Hopefully others who are new to the myriad features of the modern Apple Watch will find this note and check "Theatre Mode" if you're finding Always On is not… Always On.

To Apple: maybe Theatre Mode should automatically turn off after 24h, a little like how turning off some iPhone settings (like do not disturb) automatically reset after a very reasonable period of time.