Funds stuck on Force Close Channel with negative blocks till maturity anchor LOST

[medisoft]

• lnd v0.20.0-beta
• bitcoind full node
• lnd synced to bitcoind, and bitcoind synced to the network
• I'm using dockerized lnd

Hello! I have 3 force closed TX, with negative blocks til maturity. I verified that the closing tx are in the blockchain, and are confirmed, and that my bitcoind node have them. I also looked for pending sweeps and it is empty, looked for the outputs for the closing transactions and seems that they are used by my lnd wallet.

I'm not totally sure that the funds were recovered, and neither I'm sure why the limbo balance and the pending force close channels are still there.

{
    "total_limbo_balance":  "611953",
    "pending_open_channels":  [],
    "pending_closing_channels":  [],
    "pending_force_closing_channels":  [
        {
            "channel":  {
                "remote_node_pub":  "0290c9722262f78df35002923e202d67b53a51153d69970956862d984da1bc6351",
                "channel_point":  "79eef528b8e393d1a5f841ea3c0f577d223e2ca99f2baa65607afb2fcff25d30:1",
                "capacity":  "3000000",
                "local_balance":  "30754",
                "remote_balance":  "2942684",
                "local_chan_reserve_sat":  "0",
                "remote_chan_reserve_sat":  "0",
                "initiator":  "INITIATOR_LOCAL",
                "commitment_type":  "ANCHORS",
                "num_forwarding_packages":  "0",
                "chan_status_flags":  "",
                "private":  false,
                "memo":  "",
                "custom_channel_data":  ""
            },
            "closing_txid":  "5fbb085fe2ee1c7cbbad8c0bb642638a5d9a957463ddcd9f0a37ba9e83bc816f",
            "limbo_balance":  "55756",
            "maturity_height":  949045,
            "blocks_til_maturity":  -2953,
            "recovered_balance":  "0",
            "pending_htlcs":  [
                {
                    "incoming":  true,
                    "amount":  "25002",
                    "outpoint":  "5fbb085fe2ee1c7cbbad8c0bb642638a5d9a957463ddcd9f0a37ba9e83bc816f:2",
                    "maturity_height":  949043,
                    "blocks_til_maturity":  -2955,
                    "stage":  1
                }
            ],
            "anchor":  "LOST"
        },
        {
            "channel":  {
                "remote_node_pub":  "0304b5d7f02400b2c34f5f1ff10e68a1125e5bce4d3a513c7a8d0bba912451773a",
                "channel_point":  "d397e0a7eaf834e46972c8032facb6c3ddaee8d1a2ee261859ad4f5cb25f0f5c:1",
                "capacity":  "3000000",
                "local_balance":  "470539",
                "remote_balance":  "2500557",
                "local_chan_reserve_sat":  "0",
                "remote_chan_reserve_sat":  "0",
                "initiator":  "INITIATOR_LOCAL",
                "commitment_type":  "ANCHORS",
                "num_forwarding_packages":  "0",
                "chan_status_flags":  "",
                "private":  false,
                "memo":  "",
                "custom_channel_data":  ""
            },
            "closing_txid":  "0f8caa3457da5be246b465f068c7201aa05493cb2a80586ab9c3edf2ac156a9f",
            "limbo_balance":  "495541",
            "maturity_height":  949045,
            "blocks_til_maturity":  -2953,
            "recovered_balance":  "0",
            "pending_htlcs":  [
                {
                    "incoming":  true,
                    "amount":  "25002",
                    "outpoint":  "0f8caa3457da5be246b465f068c7201aa05493cb2a80586ab9c3edf2ac156a9f:2",
                    "maturity_height":  949043,
                    "blocks_til_maturity":  -2955,
                    "stage":  1
                }
            ],
            "anchor":  "LOST"
        },
        {
            "channel":  {
                "remote_node_pub":  "0324ba2392e25bff76abd0b1f7e4b53b5f82aa53fddc3419b051b6c801db9e2247",
                "channel_point":  "4c7703b59dfeb3fe39f51ce5fabc3d0c1f72bf7f3e1d713ddd7147c89100ad8b:1",
                "capacity":  "4000000",
                "local_balance":  "60656",
                "remote_balance":  "3936664",
                "local_chan_reserve_sat":  "0",
                "remote_chan_reserve_sat":  "0",
                "initiator":  "INITIATOR_LOCAL",
                "commitment_type":  "ANCHORS",
                "num_forwarding_packages":  "0",
                "chan_status_flags":  "",
                "private":  false,
                "memo":  "",
                "custom_channel_data":  ""
            },
            "closing_txid":  "10718ea31ff968a6d66bff3815e4fc9b5f93859b4564f39178d11d30b507d386",
            "limbo_balance":  "60656",
            "maturity_height":  948722,
            "blocks_til_maturity":  -3276,
            "recovered_balance":  "0",
            "pending_htlcs":  [],
            "anchor":  "LOST"
        }
    ],
    "waiting_close_channels":  []
}

pending sweeps

{
    "pending_sweeps": []
}

bitcoin-cli gettxout 5fbb085fe2ee1c7cbbad8c0bb642638a5d9a957463ddcd9f0a37ba9e83bc816f 2
bitcoin-cli gettxout 5fbb085fe2ee1c7cbbad8c0bb642638a5d9a957463ddcd9f0a37ba9e83bc816f 3

bitcoin-cli gettxout 0f8caa3457da5be246b465f068c7201aa05493cb2a80586ab9c3edf2ac156a9f 2
bitcoin-cli gettxout 0f8caa3457da5be246b465f068c7201aa05493cb2a80586ab9c3edf2ac156a9f 3

bitcoin-cli gettxout 10718ea31ff968a6d66bff3815e4fc9b5f93859b4564f39178d11d30b507d386 2
bitcoin-cli gettxout 10718ea31ff968a6d66bff3815e4fc9b5f93859b4564f39178d11d30b507d386 3

All of them return null, so the outputs are already spent.

Something that is different from other posts in the discussion group:

• The closing outputs are already spent.
• The local outputs were swept by LND wallet transactions labeled 0:sweep.
• lncli wallet gettx recognizes the sweep transactions.
• But lncli pendingchannels still reports the channels as pending_force_closing_channels with recovered_balance 0.

This does not look like the usual case where the force-close output is mature but still waiting to be swept. In this case, the relevant force-close outputs are already spent. The local outputs were spent by LND wallet transactions labeled 0:sweep and recognized by lncli wallet gettx. However, lncli pendingchannels still reports the same channels under pending_force_closing_channels with recovered_balance = 0 and the original limbo_balance.

Is this expected if the HTLC outputs were spent by non-wallet transactions?
Should contractcourt/channel arbitrator automatically mark these channels as resolved once the outputs are spent?
Is there a safe way to force LND to reconcile the close arbitrator state without running reset-wallet-transactions, since my bitcoind backend is remote and a full wallet rescan is very slow?
Are there specific logs or DB state entries I should inspect?

What could be the problem? And the solution?

Thank you for your help!