Totems... What The?!

So, over the past few days, I've used (or at least, tried to use) some mob totems. The ones which you place down, they last for 5 minutes and they used to multiply the mobs spawning in the aura of it.

This no longer happens.
Upon spawning the totem, they often spawn a handful (5-10 at most) of extra mobs. After that, they no longer do anything.

I've tried this on multiple servers, classes, different days and realised I should make a bug report; HOWEVER, I spoke to some people online about it and they said that the way totems work had been changed in 1.20, so it may look different.

I'm sure that what's happened is a bug and I will be making a bug report shortly, but why have the totem mechanics been changed anyway? How should they work now? Is this correct?!

I'm confused and tired at the moment and will be regretting making this thread in a day or two.

Anyway, hope you are all well and happy :)