I am also experiencing a similar problem on my android tablet (Samsung Galaxy Tab S8). When I switch into preview mode, bullets and other markdown are replaced with ‘•••••••••’. This happens as part of a loop, so if I don’t navigate away, the number of special characters continues to increase. The • characters are only added to the section of the file that I’m previewing - above and below seem to be fine. I do not get this issue on any other devices.
Edit: Yeah, it’s this issue - [Bug] Text editing gets corrupted sometimes on Android - #3 by photvedt.