The bug

"We Need to Go Deeper" description reads: "Build, light and enter a Nether Portal". You don't need to do any of these things, as the advancement is granted by simply teleporting into the Nether, either via commands or by using a pre-existing Nether portal.

To reproduce

1. /execute in minecraft:the_nether run tp 0 129 0

Observed result

The advancement is granted, despite the description.

Expected result

The advancement granting would be consistent with the description; either the advancement would not be granted or the description would be changed to reflect the actual conditions of the advancement to be granted, e.g. "Enter the Nether".

Original description

According to the advancement description, a player needs to build, light, and enter a nether portal in order to activate "We Need To Go Deeper" advancement, but actually you don't need to do any of these thing, you can simply teleport into nether, and you will be granted this advancement, despite the description.