There's 12 lines of the command /chunkinfo in the language files, yet no such command exists.

commands.chunkinfo.usage=/chunkinfo [<x> <y> <z>]
commands.chunkinfo.location=Chunk location: (%s, %s, %s)
commands.chunkinfo.noChunk=No chunk found at chunk position %s, %s, %s
commands.chunkinfo.notEmpty=Chunk is not empty.
commands.chunkinfo.empty=Chunk is empty.
commands.chunkinfo.notCompiled=Chunk is not compiled.
commands.chunkinfo.compiled=Chunk is compiled.
commands.chunkinfo.hasNoRenderableLayers=Chunk has no renderable layers.
commands.chunkinfo.hasLayers=Chunk has layers: %s
commands.chunkinfo.isEmpty=Chunk has empty layers: %s
commands.chunkinfo.vertices=%s layer's buffer contains %s vertices
commands.chunkinfo.data=First 64 vertices are: %s

(Line 1956-1967)

These lines should either be removed, or the command added.