I own a Minecraft Realm and have recently built an iron farm that utilizes a zombie in a minecart going around a track. I got the zombie into a Minecart with full armor and an item and the iron farm began to work. After a couple of hours the zombie disappeared, presumably despawning. I went into creative mode and spawned a new zombie giving it the same items and putting it back in the minecart which reproduced the issue. I then tried additionally naming the zombie even though it could already not be able to despawn when holding an item. Then after a few hours it once again disappeared.
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But yet, it does. Update Optifine, the invisible mob issue has been fixed for the full 1.16.1 release of it. In the future, when reporting bugs on the bug tracker, please make sure you can reproduce them without any modifications installed - and yes, Optifine is quite a big game modification.
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