Under bedrock y -3000000000000000000

I was so bored and I was curious and I learned that the under bedrock limit was y -3000000000000 but I was curious about going even more so I typed
/tp Burak1980 64 -3000000000000000000 64
but then I got kicked from my single player world and the kick message was
"ILLEGAL STANCE"
did i just made something illegal or was that area rescricted?
I really don't want to do something like that ı'm person that generally obeys rules and can anyone help me about this?