I am having trouble with block update variable

I have a liquid and when it is placed over soul sand after some time I want it to summon a mob in this case the Imposter. and if placed over magma it will summon a slime block item. However I have tried many things, but none of them seems to work properly. My current issue is it does in fact work, somewhat in that it summons TONES of mobs or items when placed over the blocks to the point it immediately crashes the game. the function is currently called when a neighbouring block is changed(I will also make it run when it is placed as well). here is my code. I have some msg commands for debugging, but after a change from if statements in a tick runtime to while statements that are triggered when blocks are changed they stopped working. I made that change because I believe that resets local variables, and none of the others seemed to be what I was looking for.