I'm not sure if It's a bug, but I found usual orange Chester in caves.
Server: public german server Bohramt
Mods: no mods
I asked about my find other players, and about 5 people said that they met forest Chester in caves too.
Thanks for attention,
Steps to Reproduce
Go to cave -> look for chester.
This issue has been fixed in either a future version or updated in a previous version.