Lily Autumn

Additionally forcing IPv4 does not work either.

Nor does the [unofficial ProtonVPN CLI](https://github.com/Rafficer/linux-cli-community). It simply hangs and then states "Connection failed".

> You're free to use any other VPN service. I don't think this is an issue with my network, then; because even tunnelling all connections through `sshuttle` it still does...

Though it does provide a different error ID if it matters. 

> Other mods installed Modpack is [Additive](https://modrinth.com/modpack/additive) > Game log `dmesg` stacktrace attached. > PC specs, used OS  @RaphiMC is this sufficient?

> Can you try with only ImmediatelyFast installed. Also when does the use after free happen? Unfortunately it doesn't happen at a specific point, it's entirely random. _I have four...

@RaphiMC Sorry for the delay. I have reliably reproduced it, and it looks like a chunkloading race condition. In addition to that I have an area in which I can...

@DBTDerpbox ` "fast_buffer_upload_size_mb": 256,`