Reuse of payment hash in Lightning Network

[Bitcoin]

Reuse of payment hash in Lightning Network

Suppose there exist two such payment transfer request: A transfers 1 msat to R via A->B->C->R and S transfers 5 msat to R via S->B->C->R. Let the two HTLCs be formed across both the paths simultaneously and let both the payment use the same payment hash say H. Now channels B-C and CR has two HTLC using the same payment hash. As mentioned in https://github.com/lightningnetwork/lightning-rfc/blob/master/04-onion-routing.md#failure-messages it is stated that "An intermediate hop MUST NOT, but the final node: if the payment hash has already been paid: MAY treat the payment hash as unknown or MAY succeed in accepting the HTLC." It seems that R can release the preimage of H and settle both the payment if R has received both the HTLC request at the same time. However, is it so that R will settle one payment and fail the other so as not to encourage the reuse of hash?

Source: Reuse of payment hash in Lightning Network