I created an Add on containing various mobs, blocks and items. I noticed recently that remote play causes problems. it shows errors for remote players and crashes xbox players

(1) The add-on works perfectly with no log errors when played locally.

(2) logging into the world from a remote windows 10 device displays the following errors for each block but functions properly. (the blocks can be used without a problem)

[Blocks][error]-block of name 'my_addon:my_custom_block' does not exist. did you just add an updater with a bad block name?

(3) Logging into the world from an Xbox One displays the same errors as (2) and crashes the game. (game freezes after within 30 seconds, then crashes after about a 1 minute of being frozen)

As stated the add-on works fine with no errors when played locally. its only when playing remote that issues occur.