When I shoot an arrow into the nether portal it will be damage me when I get into the portal, and can damage anybody who is standing on the other side of the portal. PvP was disabled.
is duplicated by
MC-81143Arrows shot by a player through a nether portal will still damage players on the other end of the portal even if the server has PvP disabled.
Resolved
relates to
MC-50319Player owned projectiles lose their player ownership when exiting portals