Good evening, the problem itself, are invisible new enemies, game in version 1.14 Snapshot, ask us to report errors or leave the opinion

Good evening, there is an error that bothers me, it is about enemies (Skeletons, Bandits, Defenders) that are invisible, but they keep attacking you, I would like you to solve them. I do not know if it is because of the Skin or because of an error, it is very difficult to give something that you do not see, please can correct it. I was playing and I killed a defender, (I could see this one) then I tried to look for my things and it turns out that I was not, when I put my things together, I noticed very strong blows, that came from somewhere, but I did not see anyone.