Subject of the issue

After a fast catchup, fetching the messagepack encoded first block from the API returns a 404.

Steps to reproduce

In this test, we use the conduit profile and a version of algod which causes followers to pause after a fast catchup. This makes the issue easier to reproduce.

1. mkdir test_data
2. algocfg profile set conduit -d "test_data"
3. algocfg set -p EndpointAddress -v "0.0.0.0:8080" -d "test_data"
4. cp /path/to/go-algorand/installer/genesis/betanet/genesis.json test_data/genesis.json
5. goal node start -d "test_data"
6. goal node catchup -d "test_data" 26000000#LLCDX3RAAYVU7T4ZIHBVEK4SJCIAHK4IIJLVI52SJGJIBYJHZ75Q
7. wait for catchup watch goal node status -d "test_data"
8. curl -H "Authorization: Bearer "$(cat test_data/algod.token) "http://127.0.0.1:8080/v2/blocks/26000000?format=msgpack"

Note: format=json works: curl -H "Authorization: Bearer "$(cat test_data/algod.token) "http://127.0.0.1:8080/v2/blocks/26000000?format=json"

Expected behaviour

The msgpack encoded block is returned.

Actual behaviour

An error: {"message":"failed to retrieve information from the ledger"}