itest: Unable to gen chan range query: unable to fetch highest chan ID: sql: database is closed

[yyforyongyu]

From this build, the node cannot be shut down due to error,

--- FAIL: TestLightningNetworkDaemon (2016.10s)
    harness_setup.go:25: Setting up HarnessTest...
    harness_setup.go:38: Prepare the miner and mine blocks to activate segwit...
    harness_setup.go:46: Connecting the miner at 127.0.0.1:10019 with the chain backend...
    --- FAIL: TestLightningNetworkDaemon/tranche03/146-of-314/bitcoind/multihop-local_claim_incoming_htlc_simple_taproot (94.64s)
        harness_node.go:395: Starting node (name=Alice) with PID=47411
        harness_node.go:395: Starting node (name=Bob) with PID=47695
        harness_node.go:395: Starting node (name=Carol) with PID=48226
        harness_node.go:395: Starting node (name=Bob) with PID=49400
        harness.go:561: 
            	Error Trace:	/home/runner/work/lnd/lnd/lntest/harness.go:561
            	            				/home/runner/work/lnd/lnd/itest/lnd_multi-hop_force_close_test.go:1778
            	            				/home/runner/work/lnd/lnd/itest/lnd_multi-hop_force_close_test.go:1608
            	            				/home/runner/work/lnd/lnd/lntest/harness.go:315
            	            				/home/runner/work/lnd/lnd/itest/lnd_test.go:130
            	Error:      	Received unexpected error:
            	            	[Alice]: assert shutdown failed in log[.logs-tranche3/76-multihop-local_claim_incoming_htlc_simple_taproot-Alice-037e09c6.log]: node did not shut down properly: found log lines: 2fc3c8e435a76700dea8436991de1eb12745): state=syncingChans, type=PassiveSync
            	            	2025-09-30 09:31:20.087 [ERR] DISC syncer.go:502: Unable to gen chan range query: unable to fetch highest chan ID: sql: database is closed
            	            	2025-09-30 09:31:20.087 [DBG] DISC syncer.go:538: GossipSyncer(02e7cfc7b1874ee8245278dbf289932fc3c8e435a76700dea8436991de1eb12745): state=syncingChans, type=PassiveSync
            	            	2025-09-30 09:31:20.087 [ERR] DISC syncer.go:502: Unable to gen chan range query: unable to fetch highest chan ID: sql: database is closed
            	            	2025-09-30 09:31:20.087 [DBG] DISC syncer.go:538: GossipSyncer(02e7cfc7b1874ee8245278dbf289932fc3c8e435a76700dea8436991de1eb12745): state=syncingChans, type=PassiveSync
            	            	2025-09-30 09:31:20.087 [ERR] DISC syncer.go:502: Unable to gen chan range query: unable to fetch highest chan ID: sql: database is closed
            	            	2025-09-30 09:31:20.087 [DBG] DISC syncer.go:538: GossipSyncer(02e7cfc7b1874ee8245278dbf289932fc3c8e435a76700dea8436991de1eb12745): state=syncingChans, type=PassiveSync
            	Test:       	TestLightningNetworkDaemon/tranche03/146-of-314/bitcoind/multihop-local_claim_incoming_htlc_simple_taproot
            	Messages:   	failed to stop Alice
        harness.go:393: finished test: multihop-local_claim_incoming_htlc_simple_taproot, start height=764, end height=784, mined blocks=20
        harness.go:352: test failed, skipped cleanup
    lnd_test.go:138: Failure time: 2025-09-30 09:31:20.772
FAIL

Too bad the logs are expired, but we should pay attention to this new error when it appears again.