I've noticed the right bud on my Galaxy Buds 3 Pro sometimes fails to charge in the case. It's happened to me twice. When I inspected it for any sort of obstruction, I found some smudging on the shiny metal contact at the tip of the stem (right next to the orange mark). Now I make sure to give it a wipe on my shirt or pants before putting it in the case, and I haven't had the issue again.
Seems a bit ridiculous that the charging is so easily interrupted by a thin smudge like that, I never had this problem with my Buds 2 Pro, but knowing is half the battle!
