When you summon a custom mob with "{Invulnerable:1}" tag, you can hit the mob. It's not invulnerable.
Environment
Java 8 64/32bits
Windows 7
MC-56204
Invulnerable tag doesn't work
Resolved
Duplicate
0
you're in creative, that's intended, switch to survival or adventure
duplicate of MC-51195 if you have not please use the search function in the future