Nether - floating blob thinies

Hi,

In all the nether runs I've done, each zone has those non interactable flying blob/cauldron thingies all over the map?

Non of the team mates can figure out what to do and the google search cant identify them either since i dont know how to describe them,

Any idea how those work?

Edit: People have decided and informed me that those are the indicators for encounters like in Pale heart, which i forgot bout. :[