[1.18 snapshot] "On World Update Tick" is running faster than it should

It is my understanding that the world tick is supposed to occur 20 times per second,

I have noticed that it seems to be updating much faster than that, which is causing issues with timing in my mod. 

For example, I would expect this procedure to say "Tick" into the chat once per second, however it ends up printing "Tick" many times per second.