I was playing around with the .execute command (trying to make a command wall to run the /execute command multiple times to turn the area i walk to nether themes) and when I hit a lever, the game suddenly stopped responding. The command in question is:

execute at skeletonsmith run fill ~15 ~15 ~15 ~-15 ~-15 ~-15 lava replace water

And yes mods, before you tell me to reupload, this was NOT found with optifine on and I can upload a world download if you need (just hit the lever that you're facing to crash the game).