To reproduce:
- Open inventory
- Start running left\up\down (right works too but less obvious)
- While character is running, right click on an item in the inventory (practical use, e.g. open a town portal from or drink a potion; but you can right click on a non-usable item too, e.g. short sword or any gear or empty gear slot or even empty space in the inventory)
Result: Character redirects to where the the mouse was clicked, i.e. to the right
Expected: Character should maintain their movement vector
Demonstration video: https://gfycat.com/essentialopulentdodobird
This issue is related to 2 other issues with undesired character movement: