sapling->taddr after NU5 activation causes bad-txns-sapling-spend-description-invalid error

[softminus]

sasha_work@seasonal-dream zecwallet-light-cli % git rev-parse HEAD; git status; cargo build > /dev/null; cargo run
657024be8473fb5f821f3a01d96e30341f0f6a0a
On branch master
Your branch is up to date with 'origin/master'.

nothing to commit, working tree clean
    Finished dev [unoptimized + debuginfo] target(s) in 0.12s
    Finished dev [unoptimized + debuginfo] target(s) in 0.11s
     Running `target/debug/zecwallet-cli`
Lightclient connecting to https://lwdv3.zecwallet.co:443/
{
  "result": "success"
}
Ready!
(main) Block:1687131 (type 'help') >> send t1etJZT2pHLem9B4GCk3o3QRFE3di5ywhKX 100000
0: Creating transaction sending 100000 ztoshis to 1 addresses
0: Selecting notes
0: Adding 1 notes and 0 utxos
0: Adding output
0: Building transaction
Progress: 1
Progress: 2
Progress: 3
25: Transaction created
Transaction ID: 2053858e855485b5e3da80501bebb65459100d58b047576c7aa48ca162a83618
{
  "error": "Error: SendResponse { error_code: -26, error_message: \"16: bad-txns-sapling-spend-description-invalid\" }"
}
(main) Block:1687131 (type 'help') >> 

[softminus]

breaks similarly for sapling->sapling:

(main) Block:1687136 (type 'help') >> new z
[
  "zs1wrhaeq5df89sy6rm48kuwq8njadqes4fa8wfyjdqagmf6k8v3f7e4uvgze4zx9gy9y60xaxqf3p"
]
(main) Block:1687136 (type 'help') >> send zs1wrhaeq5df89sy6rm48kuwq8njadqes4fa8wfyjdqagmf6k8v3f7e4uvgze4zx9gy9y60xaxqf3p 100000
0: Creating transaction sending 100000 ztoshis to 1 addresses
0: Selecting notes
0: Adding 1 notes and 0 utxos
0: Adding output
0: Building transaction
Progress: 1
Progress: 2
Progress: 3
23: Transaction created
Transaction ID: cccaada3ab3a7124f02d595848345cb4243128d231ee4b0d7bc711a9fe7b9acc
{
  "error": "Error: SendResponse { error_code: -26, error_message: \"16: bad-txns-sapling-spend-description-invalid\" }"
}
(main) Block:1687136 (type 'help') >> 

[adityapk00]

Looking into it....

[str4d]

This error corresponds to a verification failure in https://github.com/zcash/librustzcash/blob/73d9395c9d3c5fa81fc7becd363a2c1a51772a76/zcash_proofs/src/sapling/verifier.rs#L31-L99 (or, less likely, the FFI glue that calls it). My initial guess is the wrong consensus branch ID is being used, causing the Sapling signature to be invalid. But it could also be e.g. an invalid proof.