Lighthouse with beaconmock sometimes fails hit `/eth/v1/validator/prepare_beacon_proposer`

[gsora]

🐞 Bug Report

Probably related to #1736, exhibits the same behavior: seemingly random connection resets and presumed early EOF.

🔬 Minimal Reproduction

docker-compose logs -f vc0-lighthouse | grep "/eth/v1/validator/prepare_beacon_proposer"

🔥 Error

Error: Reqwest(reqwest::Error { kind: Request, url: Url { scheme: "http", cannot_be_a_base: false, username: "", password: None, host: Some(Domain("localhost")), port: Some(3600), path: "/eth/v1/validator/prepare_beacon_proposer", query: None, fragment: None }, source: hyper::Error(IncompleteMessage) })

🌍 Your Environment

Operating System:

  
Ubuntu Linux 22.10
  

What version of Charon are you running? (Which release)

  
v0.13.0
  

[thomasheremans]

Story Points: 3 See the discussion in Ongoing Sizing

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