We are seeing that every time we update the database with an update command or generate an update with an update-sql command, the md5sum value of every changelog record is being updated. The value is being updated to the exact same value as it was prior to the operation. We are running liquibase community version 4.23.0 to manage a cluster of Postgres databases.
I came across this topic that linked to this GH issue, the issue seems similar to ours and was closed recently saying 4.23.0 would resolve the issue.
Please let me know what other information I can provide.