Launching Minecraft 1.13.0 only boots for about 10 seconds, just past the splash screen, then crashes out — every time.

Deleting the game and re-downloading 1.12.1 from Apple's App Store it works perfectly again. (apparently they aren't serving 1.13.0 yet)

Upgrading the 1.12.1 to 1.13.0 causes it to crash again every time.