Weird mate, I've a NanoLeafs set for my Kids room and it's still there and functions correct.
Maybe wipe app cache/phone and if it still doesn't work then report it as a bug to Oppo as feedback?
Is not there mate, on google home app they appear whit no problem, i have maybe 40 IoT devices, and no problem. But on android 12 device control, if u swipe down your control center u will se device control option, there u cand add your IoT devices to easy acess on power menu.
I contact OPPO Portugal and they say to me will analyze with the team of engineers.
I contact Google Home suport and they say to contact OPPO contrariwise.
Idk, its really stupid because Xiaomi and LG thing appear normal, but google home no.
https://www.reddit.com/r/Oppo/comments/w2tlkx
u can see there people whit same bug.