This appears to be a cosmetic issue that only affects items that have changed their group name after being instantiated the first time. Reporting for player visibility to document the message and apparent cause…
PROBLEM
Content Logging can show the following warning message when starting a world with a custom behavior pack or add-on that has a custom item as well as using the crafting_item_catalog.json to place the item into a custom group:
[Item][warning]-C:/Users/abrig/AppData/Local/Packages/Microsoft.MinecraftUWP_8wekyb3d8bbwe/LocalState/games/com.mojang/development_behavior_packs/twf_jb_b/item_catalog/crafting_item_catalog.json | The item twf_jb:ring_gold_incisor was created with the group set to 'minecraft:twf_jb:itemGroup.name.rings', but is now being set to 'twf_jb:itemGroup.name.rings'
CAUSE
The warning occurs when you have changed the group<--> item assignment in the crafting_item_catalog.json after the item has already been added to a player inventory. The error cannot apparently be cleared once it occurs. It will appear every time the world is loaded with the current version of the add-on or Behavior Pack.
DESIRED BEHAVIOR
The game should make an adjustment to the Item in the world that prevents this warning occurring more than once for each changed group assignment.
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