Cursor capture sometimes fails and some users must click an extra time after launching the game (macOS only)

This ticket describes 2 issues that happen exclusively on macOS:
1. Upon loading into a world for the first time in a given session, the game sometimes fails to capture the cursor, meaning it flies around the screen as the player looks around.

2. Some users have reported that after launching the game, their first click does nothing. I personally can't reproduce this but it does still seem to be an issue in recent releases.