Same problem on my Surface Pro 4 also in Chrome. I've found two workarounds.
The easier one is to just lock the side bar. It's been working just fine so far when it's locked.
I've found the other first but it's more inconvenient and might not work on iPads. Since I've not seen this error occur on a normal PC I've tried using the on screen touchpad from Windows which is just like a on screen keyboard but for the mouse cursor. Since that way I'm using a normal mouse cursor it also works just fine but as said is very inconvenient.
Using Chrome on ipad pro. Recently (9/2/21) I have not been able to add new items to my inventory or move them from equipment to backpack, etc.
Yeah, it's a known issue. I'm hoping it doesn't take them too long to get it corrected.
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Same problem on my Surface Pro 4 also in Chrome. I've found two workarounds.
The easier one is to just lock the side bar. It's been working just fine so far when it's locked.
I've found the other first but it's more inconvenient and might not work on iPads. Since I've not seen this error occur on a normal PC I've tried using the on screen touchpad from Windows which is just like a on screen keyboard but for the mouse cursor. Since that way I'm using a normal mouse cursor it also works just fine but as said is very inconvenient.
Can't move items to backpack. Also accidentally added a crossbow bolt case and now can't remove it at all. Kind of frustrating tbh.