Swap prevention bug?

So a phorurex swapped in, and pinned my erlidom even though it has a 100% resistance to it. Is this intentional?

Is it possible that it’s not the action but the word?

So maybe Erlidom has 100% resistance to swap prevention but no resistance to being pinned.

Whatever it is I don’t think it’s very well explained by Ludia and for us, the players to have to make sense of it is a pretty poor show.

how strange, must be a bug