If 2 anvils are stacked on top of each other, or placed next to each other both facing in perpendicular directions it is possible to pass into and through them by rubbing against them.
MC-55327
Players and mobs can clip through anvils by "rubbing" against them
Resolved
Duplicate
0
jeff hamilton
(Unassigned)
Unconfirmed
Minecraft 14w20b
Retrieved
Duplicate of MC-1669