This happened to @BrokeMel too in the mining world with cave spiders, the cave spider looked like a pig, and the f3 entity showed it as a pig too. However they still attacked you, made spider noises and also dropped spider mob drops

 

If it helps, I have a named dog in my town that didn't change into a pig, so it must be specific mobs

 

I heard a lot of people in chat talking about Pigs in the water acting/sounding like Drowned, so potentially also affected.

 

All my tropical fish are also like your exes Andrew. I mean pigs.

 

Hrrrm. Maybe I should see if I can get a bucket of pig.

 

The Pig Apocalypse didn't turn mobs into pigs. They simply looked like pigs
I believe the issue is now fixed, and I actually see quite a lot of mobs are back to what they are meant to be.
However if it continues please let us know via https://ecocitycraft.com/help

TL;DR If it continues happening, it's just visual, don't worry, we'll continue investigating :)

 

Pretty sure this is still happening, I've been seeing some "pigs" in weird places lately, mostly underwater or in other places where pigs ought not to be.

 

I did a wild in main rising and saw quite a few pig fish too.

 

Please provide locations of these entities.
They may or may not be fixed now, none the less, please provide locations.

It is a visual glitch, and it looks like we may have to deal with it until we are 100% on 1.15.1+ :(