Thank you for reporting these bugs, we were able to reproduce both of them and have logged them for our team to investigate further. The lens dirt is a Monterey OS specific issue and we do not support it but are working on this for early 2022.
The character path issue is not specific to the OS but a general regression bug. There is a workaround that seems to work for me. If you change the character clothing they will look still but after you save then quit the file and reopen your project the characters will then look like they should.