Blazes, Wither Skeletons, Etc. do not spawn in Nether Fortresses, Nether Fortress Biome is Listed Incorrectly

After visiting 10+ Nether Fortresses and attempting to brute-force blaze spawns by flattening the terrain and using trapdoors, Blazes and other mobs (Skeletons, Wither Skeletons, Magma Cubes) do not appear to be spawning. This makes Wither Skeleton skulls harder to access while blaze souls are completely inaccessible.

This was marked as fixed in 1.11.1 but as of now appears to be broken. Nether Fortresses are also listed as “Nether Wastes” on the F3 debug menu while all other Nether Biomes display correctly.