Segfault after unloading chunk on custom server

[macmv]

Unloading a chunk causes a segfault:

#0  0x00007ffff2c04fc9 in  () at /usr/lib/libGLdispatch.so.0
#1  0x0000555555a944dd in glow::gl46::call_atomic_ptr_2arg<(), i32, *const u32> (name=..., ptr=<optimized out>, a=1, b=0x7fffe8ff56f4)
    at /home/macmv/.cargo/registry/src/github.com-1ecc6299db9ec823/glow-0.10.0/src/gl46.rs:4313
#2  glow::gl46::struct_commands::GlFns::DeleteVertexArrays (self=<optimized out>, n=1, arrays=0x7fffe8ff56f4) at /home/macmv/.cargo/registry/src/github.com-1ecc6299db9ec823/glow-0.10.0/src/gl46.rs:10909
#3  glow::native::{impl#2}::delete_vertex_array (self=<optimized out>, vertex_array=108) at /home/macmv/.cargo/registry/src/github.com-1ecc6299db9ec823/glow-0.10.0/src/native.rs:389
#4  0x000055555582abb8 in leafish::gl::{impl#10}::drop (self=0x7fff903e8a30) at src/gl/mod.rs:678
#5  core::ptr::drop_in_place<leafish::gl::VertexArray> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#6  core::ptr::drop_in_place<leafish::render::ChunkRenderInfo> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#7  core::ptr::drop_in_place<core::option::Option<leafish::render::ChunkRenderInfo>> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#8  core::ptr::drop_in_place<leafish::render::ChunkBuffer> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#9  core::ptr::drop_in_place<core::cell::UnsafeCell<leafish::render::ChunkBuffer>> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#10 core::ptr::drop_in_place<lock_api::rwlock::RwLock<parking_lot::raw_rwlock::RawRwLock, leafish::render::ChunkBuffer>> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#11 0x00005555556e13cd in alloc::sync::Arc<lock_api::rwlock::RwLock<parking_lot::raw_rwlock::RawRwLock, leafish::render::ChunkBuffer>>::drop_slow<lock_api::rwlock::RwLock<parking_lot::raw_rwlock::RawRwLock, leafish::render:
:ChunkBuffer>> (self=<optimized out>) at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/alloc/src/sync.rs:1092
#12 0x00005555558426ab in alloc::sync::{impl#27}::drop<lock_api::rwlock::RwLock<parking_lot::raw_rwlock::RawRwLock, leafish::render::ChunkBuffer>> (self=0x1)
    at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/alloc/src/sync.rs:1688
#13 core::ptr::drop_in_place<alloc::sync::Arc<lock_api::rwlock::RwLock<parking_lot::raw_rwlock::RawRwLock, leafish::render::ChunkBuffer>>> ()
    at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#14 core::ptr::drop_in_place<leafish::world::chunk::chunk_section::ChunkSection> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#15 0x000055555583aba9 in core::ptr::drop_in_place<core::option::Option<leafish::world::chunk::chunk_section::ChunkSection>> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#16 core::ptr::drop_in_place<[core::option::Option<leafish::world::chunk::chunk_section::ChunkSection>; 16]> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#17 core::ptr::drop_in_place<leafish::world::chunk::Chunk> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#18 0x0000555555728a6d in core::ptr::drop_in_place<(leafish::world::chunk::CPos, leafish::world::chunk::Chunk)> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ptr/mod.rs:188
#19 leafish::world::World::unload_chunk (self=<optimized out>, x=<optimized out>, z=<optimized out>, m=0x7fffb802c508) at src/world/mod.rs:803
#20 0x000055555581c0ee in leafish::server::Server::on_chunk_unload (self=<optimized out>, chunk_unload=...) at src/server/mod.rs:2587
#21 0x0000555555762467 in leafish::server::{impl#1}::spawn_reader::{closure#0} () at src/server/mod.rs:502
#22 0x000055555575d1c7 in std::sys_common::backtrace::__rust_begin_short_backtrace<leafish::server::{impl#1}::spawn_reader::{closure_env#0}, ()> (f=...)
    at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/std/src/sys_common/backtrace.rs:122
#23 0x0000555555821a9f in std::thread::{impl#0}::spawn_unchecked_::{closure#1}::{closure#0}<leafish::server::{impl#1}::spawn_reader::{closure_env#0}, ()> ()
    at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/std/src/thread/mod.rs:498
#24 core::panic::unwind_safe::{impl#23}::call_once<(), std::thread::{impl#0}::spawn_unchecked_::{closure#1}::{closure_env#0}<leafish::server::{impl#1}::spawn_reader::{closure_env#0}, ()>> (self=..., _args=())
    at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/panic/unwind_safe.rs:271
#25 std::panicking::try::do_call<core::panic::unwind_safe::AssertUnwindSafe<std::thread::{impl#0}::spawn_unchecked_::{closure#1}::{closure_env#0}<leafish::server::{impl#1}::spawn_reader::{closure_env#0}, ()>>, ()>
    (data=<optimized out>) at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/std/src/panicking.rs:492
#26 std::panicking::try<(), core::panic::unwind_safe::AssertUnwindSafe<std::thread::{impl#0}::spawn_unchecked_::{closure#1}::{closure_env#0}<leafish::server::{impl#1}::spawn_reader::{closure_env#0}, ()>>> (f=...)
    at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/std/src/panicking.rs:456
#27 std::panic::catch_unwind<core::panic::unwind_safe::AssertUnwindSafe<std::thread::{impl#0}::spawn_unchecked_::{closure#1}::{closure_env#0}<leafish::server::{impl#1}::spawn_reader::{closure_env#0}, ()>>, ()> (f=...)
    at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/std/src/panic.rs:137
#28 std::thread::{impl#0}::spawn_unchecked_::{closure#1}<leafish::server::{impl#1}::spawn_reader::{closure_env#0}, ()> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/std/src/thread/mod.rs:497
#29 core::ops::function::FnOnce::call_once<std::thread::{impl#0}::spawn_unchecked_::{closure_env#1}<leafish::server::{impl#1}::spawn_reader::{closure_env#0}, ()>, ()> ()
    at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/core/src/ops/function.rs:227
#30 0x00005555560691f3 in alloc::boxed::{impl#44}::call_once<(), dyn core::ops::function::FnOnce<(), Output=()>, alloc::alloc::Global> () at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/alloc/src/boxed.rs:1853
#31 alloc::boxed::{impl#44}::call_once<(), alloc::boxed::Box<dyn core::ops::function::FnOnce<(), Output=()>, alloc::alloc::Global>, alloc::alloc::Global> ()
    at /rustc/335ffbfa547df94ac236f5c56130cecf99c8d82b/library/alloc/src/boxed.rs:1853
--Type <RET> for more, q to quit, c to continue without paging--q

This happens when a gl::VertexArray (part of leafish::render::ChunkRenderInfo) is dropped. I really don't know the codebase, so I don't even know when this is supposed to be initialized.

The client only crashes if it unloads a rendered chunk. Non-rendered chunks do not crash when the server unloads them. This happens on all the working versions of my server; including 1.8, 1.12.2, and 1.16.5.

I'm not sending anything more than just chunk packets to the client (and the world info, and a player position packet), is there something more I'm supposed to send?