Game "ending" cluster boink

[BJ Moose]

Tie score, bottom of the 9th, no out, R2, R3. Fly ball to left field that is
caught. Runners tag up and advance with the apparent winning run scoring.
Players gather around plate area to congratulate player who scored the apparent winning run.
The defense properly appeals that R3 left early. R3 is called out for leaving early.
Meanwhile, R2 who has properly tagged up and advanced to and rounded third thinking the winning run had scored is just hanging out between third and home. After seeing that the that R3 was called out on apppeal, he advances to
home and now HE is the apparent winning run.
BUT WAIT......the defense now
claims that with so many players from the offensive team around the plate area, they were deprived of the opportunity of making a play on R2 who had
advanced home with the apparent winning run.

A ruling?