A packet is accepted if it arrives on the RPF interface to reach the RPA (downstream traveling packet) or if the router is the DF on the interface the packet arrives (upstream traveling packet).
This is what we had discussed in your previous threads on PIM BIDIR.
The objective of PIM BIDIR is to minimize the state overhead when multiple sources are present. And to use the ditribution tree instead of the register process when sending traffic to the RP (RPA = RP address) This of course may lead to some leakage or waste of bandwidth as you note but it is a tradeoff between state overhead and forwarding efficiency. Without PIM BIDIR a distribution tree for each source should be built with PIM DM or PIM SM (that uses the RP to save resources using the shared tree first)
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