Another Tuya Toy fails to stay connected with C8

Very good point!

Being experienced EE I really hate all these fussy standards. They are only a headache for the
end users.

I am having the same issue, with the same product using C8.
Presence Sensor is recognized but none of the parameters are showing up making it useless.
Also noticed that since updating to the C8 my Sonoff plugs no longer work and after multiple reboots and resetting, they are just no longer available to use which is very frustrating.
C8 seems to be a backwards step. Wish I'd just kept with the C7 which was working fine.