The same thing is happening on my end on all of my Samsung devices with S Pen support on the latest version of OSRS Mobile. This broke with the last update, and isn't the first time this has happened. Last time, Jagex broke S Pen support while improving overall mouse support. They fixed it with the next update.
Hopefully Jagex fixes this soon, as it's my preferred way to play (and I'm sure I'm not the only one). I have some issues with my fingers and wrists as a result of a sports-related injury, and the ability to hold the pen as though I was writing feels more natural and ergonomic than using a mouse.
17-Feb-2023 00:47:29