I think I found in the rule book where you would do this, as there's nothing that simply says "cancel the FTs and go to the POI".
2-10-4 says that "the activity during it (the unmerited FT), other than unsporting, flagrant, intentional, and technical fouls, shall be cancelled". And 2-10-5 says that "consumed time and additional activity...shall not be nullified". Therefore, in this case the made FT is cancelled per 2-10-4, and the fact Team B secured the rebound/gained possession is not nullified per 2-10-5.
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