Wyze Watch 44 heart rate LEDs activating for no reason

This watch isn’t worn all the time, and I regularly notice the green heart rate LEDs flashing (while it’s just sitting on a table). I checked the settings, and continuous monitoring is not enabled, so this seems like a bug?

These spurious activations drain the battery on this Wyze Watch 44 much more quickly than I would expect otherwise. I have a Wyze Watch 47 also, and that can go 6 weeks without charging if the screen isn’t activated often.