ListBoxItem toggle_refs_notify: assertion failed

I've found a rather odd assertion failure in toggle_refs_notify. I know most of the time, this is caused by a threading issue (and that's what I thought it was at first) but I've made a minimal program without threading to replicate.

import core.memory;
import core.thread;
import gtk.Label;
import gtk.ListBox;
import gtk.ListBoxRow;
import gtk.Main;
import gtk.Widget;
import std.stdio;

void main(string[] args)
{
  Main.init(args);

  breakThings();

  writefln("Fail now!");
  GC.collect();
}

void breakThings()
{
  ListBox listBox = new ListBox();
  listBox.add(new Label("My Label"));

  ListBoxRow listBoxRow = cast(ListBoxRow) listBox.getChildren.toArray!Widget[0];
}

This program produces the following output when compiled and run with dub:

Performing "debug" build using /usr/local/bin/ldc2 for x86_64.
gtk-d:gtkd 3.9.0: target for configuration "library" is up to date.
gtk-d:gstreamer 3.9.0: target for configuration "library" is up to date.
gtk-d:peas 3.9.0: target for configuration "library" is up to date.
gtk-d:sv 3.9.0: target for configuration "library" is up to date.
gtk-d:vte 3.9.0: target for configuration "library" is up to date.
test ~master: target for configuration "application" is up to date.
To force a rebuild of up-to-date targets, run again with --force.
Running ./test 
Fail now!
**
GLib-GObject:ERROR:../../../gobject/gobject.c:3055:toggle_refs_notify: assertion failed: (tstack.n_toggle_refs == 1)

I don't have a super detailed understanding of GtkD, so if I'm just being stupid and mis-using something please tell me. Otherwise, is this some kind of bug? I was not able to replicate this bug with a simple box; It seems that ListBox is important. I know that ListBox creates an automatic ListBoxRow, so perhaps that's related?

This is all compiled using LDC2. Below is the output of ldc2 --version in case it matters:

LDC - the LLVM D compiler (1.27.1-git-faea8aa):
  based on DMD v2.097.2 and LLVM 12.0.1
  built with LDC - the LLVM D compiler (1.27.1-git-faea8aa)
  Default target: x86_64-unknown-linux-gnu
  Host CPU: ivybridge
  http://dlang.org - http://wiki.dlang.org/LDC

  Registered Targets:
    aarch64    - AArch64 (little endian)
    aarch64_32 - AArch64 (little endian ILP32)
    aarch64_be - AArch64 (big endian)
    amdgcn     - AMD GCN GPUs
    arm        - ARM
    arm64      - ARM64 (little endian)
    arm64_32   - ARM64 (little endian ILP32)
    armeb      - ARM (big endian)
    avr        - Atmel AVR Microcontroller
    mips       - MIPS (32-bit big endian)
    mips64     - MIPS (64-bit big endian)
    mips64el   - MIPS (64-bit little endian)
    mipsel     - MIPS (32-bit little endian)
    msp430     - MSP430 [experimental]
    nvptx      - NVIDIA PTX 32-bit
    nvptx64    - NVIDIA PTX 64-bit
    ppc32      - PowerPC 32
    ppc32le    - PowerPC 32 LE
    ppc64      - PowerPC 64
    ppc64le    - PowerPC 64 LE
    r600       - AMD GPUs HD2XXX-HD6XXX
    riscv32    - 32-bit RISC-V
    riscv64    - 64-bit RISC-V
    thumb      - Thumb
    thumbeb    - Thumb (big endian)
    wasm32     - WebAssembly 32-bit
    wasm64     - WebAssembly 64-bit
    x86        - 32-bit X86: Pentium-Pro and above
    x86-64     - 64-bit X86: EM64T and AMD64

Thank you for any and all assistance.

gtkd-developers / GtkD

ListBoxItem toggle_refs_notify: assertion failed #343