When you are using
MultiVerse,
you really have to update to version 4.15.1. if you don't, your console will get spammed with errors on certain worlds not yet being loaded.
Some of the versioning logic I apply whenever there is a 4.15.X update, it means that this is a hotfix containing bug fixes.
If there are new features, then the 4.X.X will be changed.
My apologies again for this, and hope you can still enjoy sleep-most.