blaze can detect and attack players through blocks and also their fireballs can penetrate the corner between two adjacent blocks meaning they can see and kill players there are not within their sight
Environment
multiplayer server provided by cubed host
6 gigs of ram
29 datapacks (unrelated to mobs but tried both off and on and separate)
Mac osx Mojave (assume unrelated as other players on server have experienced issue using high quality gaming computers0
Duplicate of MC-47699