Server changing movie name

I cannot reproduce this.
I just copied one of my home videos, removed all embedded metadata and renamed it to “Hello Hello Extended.m4v”. Plex scanned the folder and added a new item called “Hello Hello Extended”. This is an “other videos” type library with Personal Media agent.
Can you confirm this file has no embedded metadata (some apps you might use to prepare the files might write something into the files)?

From https://support.plex.tv/articles/235974187-enable-repository-updating-for-supported-linux-server-distributions/

Note : Our build system changed starting with the Plex Media Server v1.15.0 release. Users who were updating via the repository prior to that release will need to do a one-time, manual confirmation of some changed values. See our forum topic for instructions.