Name For Custom Mob With Addons Not Showing In Death Message Or Bossbar

I Have Noticed A Bug With The Bedrock Addons, When You Create Your Own Custom Entity And Name It In The Texts Folder Of The Resource Pack It Will Not Show On Boss Bars Or Death Messages Instead It Simply Displays Unknown There Is Screen Shot Of That Below, However If I Do Testfor @e[type=[InsertIdentifierHere]] then it comes up fine this is a quite a big issue as a am trying to create a custom boss bar that looks rather epic but if i make a new entity and put a boss bar on it or it kills me it will say Unknown In the boss bar and if the entity kills it will just say player was slain by Unknown Hope You Can Fix This