Based on https://github.com/jito-foundation/jito-solana/releases/tag/v4.2.0-beta.2-jito with PR #1526 applied.
Why this release
Strict nonce size checks were added during an emergency patch in v4.1. The patch for this fix was improperly applied to v4.2 and the strict nonce size checks were accidentally enabled in consensus code when they should have only been enabled in block producing code.
Agave, Firedancer, and Frankendancer accepted nonce size accounts of any size during replay, but this validator client improperly rejected them, causing a consensus bug. PR #1526 fixes this by disabling strict_nonce_size_check in replay code, but leaving it in the leader code.