For context, in case it helps:
I am using the Stonebound Kreation modpack, but the crash reports don't seem to mention any other mods.
I was designing a baked potato factory when my singleplayer world crashed. The design attempted to bake food by creating a belt loop of uncooked food with a belt observer ejecting uncooked food before it could escape the machine. It seemed to work well for quite a while until I attempted to modify it. I replaced a gearbox connected to several potato-filled belts with active fans blowing fire over the belts shortly before the game crashed. I attempted to log back into the world but the game crashed within seconds. On my third attempt I instantly broke the gearbox I added and the world did not crash, then I replaced the gearbox and it crashed after a few seconds. Now I can't seem to get the machine to work without crashing the game.

Here are the crash reports in chronological order:
crash-2020-04-23_16.35.28-server.txt
crash-2020-04-23_16.39.40-server.txt
crash-2020-04-23_16.58.46-server.txt

This issue has been addressed in 0.2.3. Thanks for the report and feel free to re-open if need be.