Does not look like you need a new mask. You need a new antenna boot though. I think the reason it comes out is that the screw cap on part of the mask had come loose. The yellow metal part on the mask. The motor pushes the whole thing out.
It is not easy to thread it back in as the plastic part is now round-ish and not straight. if you really want to put in back in then you need to straighten up the last part of the pastic thread and insert it back in. Tighten the yellow cap and you are done. Or you can open the antenna casing and thread it back in by hand, move the black rubber band by hand.
Good luck.
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