Loading a patch resource pack doesn't allow loading resources from the main resource pack

[ArtyIF]

Tested versions

• Reproducible in v4.5.dev5.official [64b0990], v4.4.1.stable.official [49a5bc7]
• Not tested on earlier versions

System information

Godot v4.5.dev5 - Arch Linux #1 ZEN SMP PREEMPT_DYNAMIC Tue, 10 Jun 2025 21:32:14 +0000 on Wayland - X11 display driver, Multi-window, 1 monitor - Vulkan (Forward+) - dedicated AMD Radeon RX 570 Series (RADV POLARIS10) - AMD Ryzen 7 5700X 8-Core Processor (16 threads)

Issue description

When loading a resource pack using ProjectSettings.load_resource_pack, resources (or at least scenes) from the main resource pack become unaccessible.

Steps to reproduce

Download MRP below and follow the readme

Minimal reproduction project (MRP)

pck-mrp_2025-06-17_16-55-50.zip

[AThousandShips]

Does this work when loading with paths instead of UIDs? UIDs have been reported to not work in some cases on export, also does it work if you disable converting text resources to binary?

This might be related to:

• Getting Resource UID Returns Invalid (-1) at Runtime on Exported Projects #75617

[ArtyIF]

In the MRP, I'm getting the path from a string with an @export_file annotation. Maybe it converts to a UID on export?

But when using the path directly (ResourceLoader.load("res://main_pck_label.tscn")), it still doesn't work. Disabling converting text resources to binary doesn't fix it either.

[AThousandShips]

It doesn't convert it to a UID, it's a UID in the MRP to begin with, or did you enter it as a file path in the inspector? To not use a UID for that you should use export_file_path, see #104379

Does it work with load instead of ResourceLoader.load?

[ArtyIF]

It doesn't convert it to a UID, it's a UID in the MRP to begin with, or did you enter it as a file path in the inspector? To not use a UID for that you should use export_file_path, see #104379

Didn't know that. Yes, I entered it in the inspector.

Does it work with load instead of ResourceLoader.load?

No, it doesn't.