Traded with a person for Trundle, despite selecting Constable Trundle, I played with Traditional Trundle. Once in game, I asked, and the Mundo I traded with owned Traditional Trundle, and didn't own Corporate Mundo, the skin he was playing with and I own.
jaymonster1381 votesI had the same bug. I swapped varus and soraka during a ranked match and got a skin I don't own for varus.
Riotmoonstones1 votesHey Darth Azrael,
Thanks for the report! We're currently investigating the issue.
Aureus Ignis4 votesIf you want to add it as a feature to encourage teamwork, that works too! lol
IsmokeOregano1 votesyea!^
The Phyrrhical1 votesI know the direct cause of this issue, it's not trading owned skins, it's keeping the slot id of the skin constant while the champ switches over. I.E. If I pick Ezreal, and use Nottingham Ezreal (The 2nd skin), and trade someone for Alistar, I play with Alistar's 2nd skin (Black Alistar), unless I rechoose my skin after swapping.
Riotmoonstones1 votesThanks for the lead!
Kaiser Noah1 votesLeast you got to play with quite a rare skin!