Just chiming in to emphasize this, because I haven’t seen it acknowledged (I also reported it months or years ago!) As a rule, I DO NOT TOUCH any file from my phone except my one “Phone notes” file, specifically because I’m now terrified of data loss. And yet all of these sync problems — I see it a few times a month — are attributed to a sync from my iPhone.
I just learned about the conflict file setting and turned that on, so hopefully that will easy my mind a bit.