`lightning_hsmd: Received wally_err attempting to sign input 0 with key`

[enaples]

After creating a psbt with 2 taproot inputs, the signpsbt makes the node to crash either experimental-dual-fund flag is enabled or disabled.

I report logs for convenience:

lightningd-1 2026-04-13T15:18:32.440Z **BROKEN** hsmd: Received wally_err attempting to sign input 0 with key 0202eccf6242a0d2e5f49738d240f99c10df108381af8ca281d4a820a6dd65e17f. PSBT: 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 (version v26.04rc2-23-gf2b7017)
lightningd-1 2026-04-13T15:18:32.440Z **BROKEN** hsmd: backtrace: hsmd/hsmd.c:689 (hsmd_status_failed) 0x102bec9e7
lightningd-1 2026-04-13T15:18:32.440Z **BROKEN** hsmd: backtrace: hsmd/libhsmd.c:611 (sign_our_inputs) 0x102bfcef7
lightningd-1 2026-04-13T15:18:32.440Z **BROKEN** hsmd: backtrace: hsmd/libhsmd.c:1407 (handle_sign_withdrawal_tx) 0x102bfa7f3
lightningd-1 2026-04-13T15:18:32.441Z **BROKEN** hsmd: backtrace: hsmd/hsmd.c:808 (handle_client) 0x102beccf7
lightningd-1 2026-04-13T15:18:32.441Z **BROKEN** hsmd: backtrace: ccan/ccan/io/io.c:60 (next_plan) 0x102c2892f
lightningd-1 2026-04-13T15:18:32.441Z **BROKEN** hsmd: backtrace: ccan/ccan/io/io.c:422 (do_plan) 0x102c2892f
lightningd-1 2026-04-13T15:18:32.441Z **BROKEN** hsmd: backtrace: ccan/ccan/io/io.c:439 (io_ready) 0x102c28857
lightningd-1 2026-04-13T15:18:32.441Z **BROKEN** hsmd: backtrace: ccan/ccan/io/poll.c:470 (io_loop) 0x102c2a1f3
lightningd-1 2026-04-13T15:18:32.441Z **BROKEN** hsmd: backtrace: (null):0 ((null)) 0x102ca512b
lightningd-1 2026-04-13T15:18:32.442Z **BROKEN** hsmd: STATUS_FAIL_INTERNAL_ERROR: Received wally_err attempting to sign input 0 with key 0202eccf6242a0d2e5f49738d240f99c10df108381af8ca281d4a820a6dd65e17f. PSBT: 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

stderr

lightning_hsmd: Received wally_err attempting to sign input 0 with key 0202eccf6242a0d2e5f49738d240f99c10df108381af8ca281d4a820a6dd65e17f. PSBT: 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 (version v26.04rc2-23-gf2b7017)
0x102ca5507 ???
        send_backtrace+0x4f:0
0x102bec9e7 hsmd_status_failed
        hsmd/hsmd.c:689
0x102bfcef7 sign_our_inputs
        hsmd/libhsmd.c:611
0x102bfa7f3 handle_sign_withdrawal_tx
        hsmd/libhsmd.c:1407
0x102beccf7 handle_client
        hsmd/hsmd.c:808
0x102c2892f next_plan
        ccan/ccan/io/io.c:60
0x102c2892f do_plan
        ccan/ccan/io/io.c:422
0x102c28857 io_ready
        ccan/ccan/io/io.c:439
0x102c2a1f3 io_loop
        ccan/ccan/io/poll.c:470
0x102ca512b ???
        main+0x9b:0