double click glitch on post-combat update

So I am on a mac. I open a vanilla world and I can not interact with anything unless I double-click. For example, on the main menu, I click a button once, nothing happens. Click it twice, and I successfully interact. If I am playing, I can't even break blocks without double-clicking. To get around this I simply close my game and re-open it. Very easy to replicate. In a nutshell, no LMB inputs are detected unless I do a double click, which will be translated into one interaction in-game.