Light Client: Absence proof verification doesn't work

[ashcherbakov]

Tendermint version: v0.34.14 and master(233f40963f5e26ea34a8d546d83714dc96600d7f)
ABCI app: Cosmos-sdk and https://github.com/zigbee-alliance/distributed-compliance-ledger

What happened:

• LightClient proxy is started
• An ABCI query request is sent via light client proxy where there is no value for the given key in the store
• Absence proof verification fails with the error: verify absence proof: key path string must start with a forward slash '/'

What you expected to happen:

• No error. Absence proof is successfully verified.

Have you tried the latest version: yes

I believe the reason is that not a full path (without a store prefix) is passed to VerifyAbsence function in https://github.com/tendermint/tendermint/blob/master/light/rpc/client.go.

[ashcherbakov]

Fix: #7639

[brennhill]

Is this still open?