Not sure if this is really a bug however in the new update when yuo set your inventory button to TAB it doesnt let you use the same button to close the inventory.

Put the summary of the bug you're having here

What I expected to happen was...:
Open inventory with TAB then close with TAB

What actually happened was...:
Only able to close inventory with ESC

Steps to Reproduce:
1. Set Tab as open/close inventory
2. open inventory
3. try to close inventory