yes you have to wait until pass expire and than remove game because it will remain on your account saying "pre-loaded" and "buy to play" than sync your account here.
I had same issue with guess pass and entering giveaways.
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If the pass already expired , sync your account here : http://www.steamgifts.com/sync :)
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I got a killing floor guest pass, so now when I try to enter a giveaway for killing floor, I can't because it says it already exists in my account.
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