The bug
Sometimes, when you hit a minecart, boat, item frame, painting, or armor stand in Creative mode, the block behind it is broken as if the attack phased through the entity. The said entity still disappears as normal.
How to reproduce
Summon said entities and punch them in Creative (make sure you're not holding a sword). The block behind the entity should occasionally break as well.
Code analysis
Code analysis by @unknown can be found in this comment.
Linked issues
is duplicated by 7
MC-263457
When breaking a end crystal in creative hit extends and breaks any block behind the hitbox too
Resolved
MC-238388
Paintings
Resolved
MC-233403
Double breaking Paintings Bug in Creative mode
Resolved
MC-215426
Removing a Minecart in Creative Mode can create particles of the block behind it
Resolved
MC-215434
It is possible to simultaneously break a block and remove an entity while in Creative Mode
Resolved
Attachments
Comments 40
(Apologies if this is a duplicate, the closest issue I could find was MC-58597 which describes a different issue/cause.)
Still reproducible in 1.8.1-pre3. It doesn't seem to be caused by bouncing since this does not affect mobs or blocks. However this definitely seems to happen less on my fast PC than on my laptop (attached results).
[^[Bug] MC-73162.zip]