The bug
A biome on my realm, Redwood Taiga Hills M, should be named Mega Taiga Hills M. I am pretty sure that this is still there from when the Mega Taiga was called a Redwood Taiga.
How to reproduce
Create a world with the seed being -5375906757781792108
/tp -2614 88 -1794
Attachments
Comments 3
Can also confirmed that it is fixed. In 1.13-pre5 it got changed to minecraft:giant_spruce_taiga_hills.
Fixed with the biome name changes in 18w16a or 18w19a (1.13). Now it's known as "Giant Spruce Taiga Hills" and it's consistent with the other variants.