[MC-265152] Custom advancements in the datapack has not enabled

What I expected to happen was...:
The custom advancements can be read successfully

What actually happened was...:
Custom advancements cannot be read

Steps to Reproduce:
1. Find a datapack with custom advancements
2.Create a new world
3.Load this datapack

4.Use this command:/advancement grant @s from <advancement ID>

Linked issues

Duplicate of MC-265126.

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We're tracking this issue in MC-265126, so this ticket is being resolved and linked as a duplicate.

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