When shooting an arrow (entity) through an portal, it goes out the other side.
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It doesn't go through the portal though. It goes past. That doesn't look the same as the duplicate.
As I've tested it in MC-2110 it is a graphical glitch. You cannot pick those arrows up, nor do they damage you if you shoot it from a dispenser.
Ah. Ok. That's good to know. 🙂
Duplicate of MC-2110.