i did a quick test on legacy editor (and closing it using Ctrl P > close active pane). i’m not able to repro that. i have few suggestion
- update the installer version to the latest by redownloading the installer from website and run the installer (i’m assuming u only update it via app auto-update)
- use “source mode” in the new editor (it’s almost the same if not better than legacy editor). if u need to have only plain-text with visual formatting you may refer to this post ( Disable markdown - Resolved help - Obsidian Forum)