I cant change the fire spread gamerule??

basically, im trying to disable the fire spreading, as ive got an infinite lava source and a cobble gen. and twice my house has caught fire. sure i could remove the lava, but its spreading THROUGH terracotta and stone.

so im trying to disable firespread doing /gamerule doFireTick false, but it doesnt exist. i run fabric. is this related in any way?