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i roughly agree with whats been said

has anyone considered the extent to which the river 3 changes the first hand? 87s is very likely from MP2 here and we now have queens up

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The river 3 doesn't change the first hand unless MP2 has 87. Otherwise, you're either already ahead of MP2's pair or behind MP2's set and the river 3 pairing on the board doesn't affect the outcome. So it is possible that MP2 has 87s, but against every other hand in his range the river 3 is meaningless.

If the board were something like JT93 and another 3 came on the river, it would be much more likely that you counterfeited villain's two pair, as villain could limp with JTs, T9s, or J9s, which is a much wider range of possible two pairs than in the OP. That would also open a new can of worms as far as the play of this hand, but I think you can see my point.