Can't undelegate: "invalid Bech32 prefix; expected cosmos, got cosmosvaloper"

[NodeGuy]

UI Version: 03067df

Description:

$ yarn build:gaia
$ yarn build:local --overwrite=true
$ yarn start local-testnet

1. Log in using the local account.
2. Undelegate 1 atom.

A notification reports success but the undelegation fails:

The HTTP response is invalid Bech32 prefix; expected cosmos, got cosmosvaloper.

[faboweb]

Can't replicate this. You're sure you did yarn build:gaia?

[faboweb]

Oh. It does undelegate, but another request (GET http://localhost:9070/stake/delegators/cosmosvaloper1qnqck57r07m82p2p2062trdjx6jh329ndcwcla/delegations/cosmosvaloper1qnqck57r07m82p2p2062trdjx6jh329ndcwcla) is failing.