Closely relates to MC-236624 and MC-236701. Also relates to MC-125315. More tenuously related to MC-89593, MC-30527, MC-172999 and MC-236614.

The bug

Lush caves and dripstone caves are naturally-generating overworld biomes, and as such it would be expected that they count towards the Adventuring Time advancement. This, however, does not seem to be the case.

Affected biomes

• Lush Caves
• Dripstone Caves

How to reproduce

• Kill a monster
• Go to a cave biome listed above, taking care to not go into any other biomes
• Open up your advancements
  Notice only one biome has been accounted for (the spawn biome)

Expected result

Entering one of these biomes would increase the number of biomes shown as being entered, and would be a requirement for the advancement.

Actual result

The advancement seems to completely ignore these two biomes.

Further notes

The ability to see in-game what biomes have been entered so far for this advancement would be far more convenient than it is currently, both for those trying to get the advancement and for debugging it like here. This could also apply to other advancements such as A Balanced Diet and Two by Two.