I also am on Standard Notes and haven't noticed it being buggy. But I'm presently a free user and never switch editors.

It was after buggy experiences on Simplenote that I had to jump ship. I don't know if I just had too many notes, or what, but it became slow, updated in weird ways that lost things or copied the same line multiple times, jumped to the top when I tried to scroll down, etc. Just all manner of strange behaviors.