I am also experiencing this issue.
I have an M1 Macbook Air running MaOS Monterey Version 12.0 Beta (21A5304g) with a fresh install of Python 3.9.6.
When attempting to save or open anything from either the editor or console window I get the following error message "The Save file operation failed. The save file operation failed to connect to the open and save panel service.”
I have granted the IDEL full drive access which hasn't resolved the issue. The dialog prevents any savings from occurring making the IDEL useless.
I have submitted this issue through Apple's Feedback tool as well.