Any patch release made for an Axon project aims to resolve bugs. This page provides an overview of patch releases for the Axon Mongo Extension.
Axon Framework release 4.1 saw the introduction of split and merge operations. These impact the TokenStore interface, more specifically with the initializeSegment(TrackingToken, String, int) and deleteToken(String, int)`.
Issue #3 marks the requirement for the MongoTokenStore to implement these as well.
The Mongo extension incorrectly used the content type instead of the tokens type upon storing a serialized token. The issue was marked and resolved under #1.