On mobile (iOS at least), if you start swiping left or right (to show the left/right sidebars), if the sidebar doesn’t open up fully (ie you let go before a complete open of the sidebar), scrolling up/down in the main editor view breaks. Scrolling up/down only becomes possible again after you open a sidebar fully or press somewhere in the text editor to bring up the keyboard.

This is pretty major as it’s easy sometimes to accidentally do a partial swipe left/right, and makes the app seem like it completely stopped being responsive.