When running with -Dcubicchunks.debug.biomes=true, on seed 7278534713916629546 with horizontal view distance 7, vertical view distance 8, serverside vertical view distance set to default value (3), at position 303, 110, 238, after waiing for everything to generate, and rejoining the world - when facing west some chunks won't be rendered until player changes blocks in them:

It also doesn't look the same each time:

May be worth checking if #40 didn't get reintroduced?

I finally tracked it down as vanilla bug, what I suspected since I first saw it:

To reproduce:

• Start dedicated server with seed that has non-ocean terrain near chunk (14, 14).
• set world spawn to 303 110 238
• teleport to spawnpoint location while flying
• quit and rejoin the server. Looking west, you should see chunk holes.

Alternatively instead of setting spawnpoint you can have other player or chunkloader at that location.

Setting forge config option to force threaded chunk loading partially works around the issue.

Reported: https://bugs.mojang.com/browse/MC-120079