Weird bedrock subchunk

broken

version 9 subchunk with only one block?

09 01 04
[]           sub_chunk_version = 9
   []        num_storages = 1
      []     sub_chunk_index = 4
00 00
!! !! two empty bytes !!
nbt
0a 00 00 08 04 00 6e616d65 13006d696e6563726166743a73... (nbt continues)
[]                         type: compound
   [   ]                   nameLength 0
         []                type: string
            [   ]          nameLength 4
                  [      ] "name"

It appears that if there is only one block the runtime flag / runtime palette byte is 0,
followed by an empty byte (i.e. NO palette) and a single nbt representing the one block
in the chunk at 0, sub_chunk_index * 16, 0?


Here is the whole subChunk:
090104000a00000804006e616d6513006d696e6563726166743a73616e6473746f6e650a0600737461746573080f0073616e645f73746f6e655f74797065070064656661756c740003070076657273696f6e03d2100100

normal

A normal subChunk version 9:

09 01 05
[]           sub_chunk_version = 9
   []        num_storages = 1
      []     sub_chunk_index = 5
04 0040a5aa0040a5aa0050a9aa0050aaaa0050aaaa0050aaaa0050aaaa0095aaaa0095a... (storages continue)
[] palette lookup and flag
   [... storages continue...]

offset to palette and nbt points here
palette and offset
04 00 00 00 = pallete size (4)
nbt
0a 00 00 08 04 00 6e616d65 13006d696e6563726166743a736... (nbt continues)
[]                         type: compound
   [   ]                   nameLength 0
         []                type: string
            [   ]          nameLength 4
                  [      ] "name"

This chunk has the following keyTypes present in the db (all numbers in decimal):

44 (version: 22)
45 (biomes and elevation)
47 (subchunks)
54 (finalized state: 2)

All the other subchunks have the same version and finalized state.