get_block_at((x, y, z)) returns None

[9NONAGON]

I loaded the region the block is in, yet it returns None This happens every time I call get_block_at()

[MestreLion]

Block format in chunks changed considerably since 1.13, so methods such as Chunk.get_section_blocks() and specially Chunk._decode_blockstates() are most likely outdated and need to be fixed.

Currently I have no time to work on the project, but PRs are welcome!