EDIT: looks like a duplicate of this https://bugs.mojang.com/browse/MC-242708

Dont see a way to delete a ticket, and searching this site for already submitted bugs is a nightmare from a user perspective. My apologies.

When in a world, entering spectator mode and going below ground almost instantly causes the game to freeze up, show Not Responding, and then crash with Exit Code 0, with no further info recorded to the logs.

seed: 7622425889317351500

Step 1: Create new world, and enter spectator mode

Step 2: go downwards below ground, the game freezes the moment you go below ground

This consistently happens every time in any world, 

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PC Specs
Processor: Intel(R) Core(TM) i7-8700K CPU @ 3.70GHz   3.70 GHz

RAM: 32GB

GPU: Nvidia GeForce 1070ti