locatebiome bug in snapshots (21w06a)

In the snapshot 21w06a, i went to type in the command (in spectator mode) "/locatebiome minecraft:Dripstone_caves" with the guided search on (it told me this biome exists), but when I hit enter to send the command, the game gives me an error saying this biome does not exist.

What I expected to happen was...:
I was hoping that the game would send a message back telling me the coordinates of the nearest cave biome, as it always does.

What actually happened was...:
I got an error message saying the dripstone cave biomes does not exist

Steps to Reproduce:
1. type in the command (in spectator mode) "/locatebiome minecraft:Dripstone_caves"
2. hit enter
3. the error should come up, this may take a second.