In the Help vault, and in a new vault, option-s for ß does work, surprisingly, but ctrl-p/n for autocomplete backwards/forwards does not. And I checked, but option-s is not bound to anything either in the Obsidian preferences or the general Mac ones.
Note that option-s for ß worked fine in my own vault up until maybe two updates ago.
No, those commands should not be cmd-p/n on a Mac. It’s control-… like in the terminal. For instance, ctrl-r works fine in both terminal and Obsidian for redo. The jump commands ctrl-o and ctrl-i work in Obsidian, too, and also the scroll commands ctrl-f, d, b, and u.
I found that ctrl-o (normal mode for one command then back to insert) doesn’t work in Obsidian either.
Installer version 0.11.0. Will try reinstalling the application now.
Update: Now installer version is 0.11.9, insider build 0.11.10, problems persist.