Desktop has similar issues (each view seems to remember scroll position separately)
on desktop I get around it by just not using the reading mode (rendered markup setting + rich markdown plugin to display html images + my copy as html/paste as markdown/image resize plugins so I don't need reading mode or rich text editor for copy/paste or resizing images)
on android it would be nice if there was a way to just disable the reading mode (especially when using the rich text editor, where reading mode doesn't serve a purpose beyond preventing accidental edits)