The PS5<>LG interaction is fucked. The TV will wake up all its devices when one of them does, and the PS5 will grab the input even if it wasn't the initiator.

You can disable this in config, but it's all-or-nothing: now the PS5 can't wake the TV at all.

Attempting to report the misbehavior to LG and Sony is like shouting into the void. They don't care, or it's the other entity's problem, or both.