We moved into a new flat with really bad lighting and I decided to buy those "AmazeFun" (or whatever generic named CN brand) "smart" LED ceiling lights. Bought one for each of four rooms.

Installed, tested them with the app, everything works, great!

Got out the remotes since pulling out the phone to use the app every time you want to turn on the light in the room is a bit much for me. Pressed Power, boom, the whole house is powered on. Dimmer, light temperature, everything syncs between all four lights. Power off turns them all off.

Wrote to "AmazeFun" support, turns out it's "normal behavior". Right.