On the bright side, this issue finally got me to create a forum account. Experiencing this as well on my iPhone using iPhone/iPad/Mac. It might also be occurring on my iPad but I don’t use the toolbar there so I wouldn’t notice.
Disabling settings sync would be difficult, not having to think about different configurations is why I started paying for Obsidian. I hope this gets figured out, I don’t prefer working on my phone but it’s the device I always have on me so this feature is important.