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It was in last year's contest announcement, comic #428, that his avatar had somehow become physically female, and he's been that way ever since. It's easy to miss since he didn't make a big deal out of it and it wasn't part of the canon comic.
I know about #428. Just had the feeling that he switched gender multiple times.
To be fair, do to the chibiform his face facial characteristics had some female looking parts, even when it was a male avatar. After #428 the chibiform has boobs and wider hipps.
In this page, we don't see the chestpart clearly, he could actually be male in this page (except the for the hairstyle, that is the same as last time).