I’m on my second pair. The first pair had the same problem and I’ve managed to get them replaced at the shop. Now I’m on second and the same problem started a while ago. I left them in my backpack for a couple of months and today I had a thought to give them a second chance.
I’ve read that thread and tried everything.
And at last the thing that worked was taking out the working bud from the case and leaving the not working one in the case, then charging it for a while a couple of times. So charge the one bud till the light is white, try pairing and charge the one again until it works.
I’ve unpaired them before that in both Bluetooth settings and x app. Then paired them in Google settings and it appeared in x automatically.
It seems the charging is somehow broken and charges only one at a time.
They work for now, will see how long.
Hope it helps someone.