Custom items can't be used in commands (give/clear/replaceitem)

Partner Rank:

1

Partner Team Reporting:

Everbloom Games

Verification builds:

1.16.100.55

Summary:

Custom items can't be used in commands (give/clear/replaceitem); they are seen as a syntax error

Impact:

This makes custom items in maps basically unobtainable, with the only workaround for giving items being loot tables and crafting recipes.

Repro Steps:

1. Open the provided world
2. Head to the blue-floored chunk with 3 buttons and an item frame
3. You should see a quiver in the item frame. This is the custom item (test:quiver).
4. Press all the buttons from right to left.

Expected:

• The "Loot Table" button should spawn an entity that immediately dies and drops a quiver
• The "Clear" button should clear your quiver
• The "Give" button should give you another quiver

Observed:

• The "Loot Table" button should spawn an entity that immediately dies and drops a quiver
• The "Clear" button does nothing
• The "Give" button does nothing

Screenshots/Videos attached: Yes/No

No

Regression Builds:

This last worked in 1.16.100.54