Game crashes when alt-tabbed. No error message.

[JamieRose]

Ever since patch 6.45 happened, every time that I alt-tab out of the game it crashes with no error message. It's almost like the game itself hits "exit game" without my permission. I thought this was due to the game running in fullscreen, but after changing to borderless window the problem persists.

This was NOT happening before the patch was released.

Steps I've taken:
Resetting computer.
Turning off computer overnight
Updating GPU drivers
Disabling background programs
Restoring game data
Reinstalling the game

None of this has worked.