I also encountered this problem.
nothing ear (a) yellow
After the update, the battery life of the left earphone has deteriorated sharply
In my case, the earphone charges up to 75%, but completely discharges before turning off in ±10 minutes.
I can say that I completely lost my left earphone.
I’m going to apply under warranty with a suspicion of a defective battery or its controller
(╯︵╰,)