grpc error and payment claims

I'm having an issue on a swapin. The state of the active swap on my LBTC node shows:
"state": "State_SwapInSender_AwaitClaimPayment"

The state of my counterpart's lightning node shows:
"state": "State_ClaimedPreimage"

The opening tx has confirmed on mempool for thousands of confirmations. The decoded LN invoice shows my node as destination, I'm running LND. The peerswapd terminal is showing a grpc error constantly since the swapin: [DEBUG] [grpc_conn]: grpc_retry attempt: ####, backoff for 30s, with an increasing number of retries ####.

The pscli is able to connect to the LND RPC. It shows available peer channels and their current channel balances. I don't currently believe the RPC pathway to be at fault. The LND node has been operational for months. The LBTC node is recent but has handled receives from Aqua without a problem.