consensus error when running cometbft + tendermint-rs

[taturosati]

What went wrong?

I have tried running theoreticaly supported tendermint version with tendermint-rs implementation of kvstore but it got stuck on start. Found this issue #1463 which suggested chainging to cometbft.

That fixes the initial issue but when trying to send a transaction I am getting error:

CONSENSUS FAILURE!!!                         module=consensus err="failed to apply block; error expected tx results length to match size of transactions in block. Expected 1, got 0

Steps to reproduce

1. Start kvstore (on version 0.39.1 or 0.39.0):

cargo run --bin kvstore-rs --features binary,kvstore-app,client

2. Start cometbft (on version 0.38.12):

cometbft unsafe-reset-all && cometbft node

3. Send tx:

curl 'http://127.0.0.1:26657/broadcast_tx_async?tx="somekey=somevalue"'

Definition of "done"

Cometbft should be able to reach consensus on simple kvserver (it works with their internal example)