I've been playing Soulworker since Xigncode got proton support, however I've yet to find a proper fix for this little annoyance. A workaround I've been successfully using is just opening my inventory or some other menu to bring up the cursor.
When I mash Alt rapidly I can see the mouse cursor appear for a few frames, so it's trying. Possibly seeing double input?
Thanks for any help!
You know it's true because that dev only has one Friggin screen. No wonder multi monitor support is fucked.