Mastery tokens in 3v3 mode?

Hello, just wanted to know if mastery tokens are disabled for twisted treeline. Just played a game of Corki to get my last mastery 7 token, I got an S+ but no token,... Is it normal, or is it related to the current bugs on XP ? ( I never played on twisted treeline to earn tokens before, so cant tell by myself) {{champion:42}}
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