In the inventory and crafting table UI, when hovering over the recipe button, it goes into the highlighted state, when you hover off of it, it goes back to normal. Clicking the button leaves it highlighted, but clicking it again once more to close the menu, leaves it highlighted, which I believe it should go back to normal. It also changes states when you choose to enable which recipes are shown (craftable / uncraftable) (My cursor doesn't show up in the screenshots, but you can tell when Im not hovering over the button due to the player character looking the other way)