Walking into Invisible objects

So i've been playing this world with my brother using current updates ( 1.16 Snapshots - 1.16 Pre release 5) And so far i haven't had any corrupt world issues until prere-5. When i walked around my village i sometime walk into 1x1 invisible animals/objects. I'm pretty sure the invisible thing is an entity because i can slightly push i around. It may be a invisible Iron Golem because I have about 8-12 IG in my village. There are no problems on Pre 4 when i reverted to my backups. Not totally sure if this happens in worlds directly created in Pre 5.