Minecraft Version

1.16.x

Version

1.99.1

Details

Reproduced easily: open a new world and open any computer (or turtle). Instead of normal behavior, the computer outputs this screen:

In the console, the following is printed:
onComputerOpen.txt

Otherwise, Minecraft runs as normal, and the game does not crash completely. The player can safely ignore this issue, though using any computer is obviously impossible.

On testing, I accidentally placed a computer next to a turtle. This causes the game to immediately crash and also soft locks the world: the game crashes before it is able to load the player in. The crash log is below:
crash-2022-01-07_20.14.25-server.txt

See #972. Supplementaries is bundling the CC:T API by mistake - upgrading to their latest version should fix things.