This is a release candidate and is not meant for production. It is only meant for testnet / devnet deployments.
Note: As testnet was reorganized to properly test a migration from v19.3.0 to v20 which is in progress, in order to get to a functioning chain, you may need to invalidateblock 000001e6e9460c5d7793cad25bb1e5bcdd61c0d35e8906a1a617f0debe24890a. At the time of publish insight is on the correct chain and can be used for reference. Additional chain locks are functional on this re-organized chain.
See the full change log here
See the change log from v20.0.0-rc.2 here