Mattermost 4.0.2 is planned with the following fixes:
- GitLab single sign-on fails if non-English language set in Mattermost Account Settings (ticket link). Other single sign-on methods are being investigated.
- Custom slash commands don’t work in direct message channels (ticket link).
AmazonS3Regionconfig setting is ignored in Minio file storage setup (ticket link).
Note that the release date is tentative and we’ll give more updates as we get closed to the patch release.