I recently updated to 2021.2.0f1 (Apple Silicon) and noticed some new behavior when "Script changes while playing" is set to "Recompile after finished playing". When the game is playing in-editor, modifications to scripts will trigger a compilation popup that appears to go through the compilation and import stages. Stopping play will show a second popup, this one going through the assembly reload stage. Based on my experience with this setting in 2020.3.15f2, I'd normally expect script changes to have no effect on the editor until play is stopped. Fortunately, the re-compile is very fast on Apple Silicon (thanks for working on that!), so this issue is less distracting than it could be.