[1.21] Registering too many GUI layers causes some to be invisible

[embeddedt]

Minecraft Version: 1.21

NeoForge Version: 21.0.112-beta

Description of issue:

Presumably due to the LayeredDraw system using a fixed Z separation of 200 units between layers, adding enough layers causes the top ones to become invisible.

To reproduce, add a loop like below to any mod that renders a custom GUI layer and run it standalone. The modded layer will be invisible.

private void onRegisterGuiLayers(RegisterGuiLayersEvent event) {
    // Register some placeholder layers
    for(int i = 0; i < 50; i++) {
        event.registerAboveAll(ResourceLocation.fromNamespaceAndPath(MOD_ID, "fake_" + i), new LayeredDraw.Layer() {
            @Override
        public void render(GuiGraphics guiGraphics, DeltaTracker deltaTracker) {

        }
        });
    }
    // Register the real layer
    event.registerAboveAll(ResourceLocation.fromNamespaceAndPath(MOD_ID, "hud"), new ModdedHUDRenderLayer());
}

[KyBeeS]

Issue is occurring again in current release of all the mods 10. We're having issues reproducing it with other mod combinations and it's seemingly random. Seems it may be a neoforge issue but we're not sure

[XFactHD]

I can reproduce the issue in both ATM10 and a dev environment. I have opened a separate issue for it, see #1504 for more details