--convert-3to4 doesn't handle paths properly

[TokisanGames]

Godot version

4.0alpha12

System information

Win 10/64 NVIDIA GeForce GTX 1060/PCIe/SSE2

Issue description

I'm just started my porting journey. I have a 6GB repo, 5100 files (assets, code, scenes), a scene loader that loads and swaps between individual scene levels. These level scenes are under /project/scenes/. The script can't read those files, probably because it isn't handling slashes properly as shown below.

I'll seek out the standalone script and see if I can make more progress with it as the built in one failed before getting out of the gate. It didn't even list the main scene, which is down in \project\src\scene_loader\SceneLoader.tscn and should be set in the project file.

/d/gd/oota/gd4/project$ /d/gd/Godot_v4.0-alpha12_win64.exe --convert-3to4

Godot Engine v4.0.alpha12.official.2c11e6d9e - https://godotengine.org
Vulkan API 1.2.0 - Using Vulkan Device #0: NVIDIA - NVIDIA GeForce GTX 1060

Starting conversion.
Trying to convert       1/15 file - "default_bus_layout.tres" with size - 2 KB
    File was not changed, checking took 12 ms.
Trying to convert       2/15 file - "project.godot" with size - 23 KB
    File was changed, conversion took 4 ms.
Conversion ended - all files(15), converted files(1), not converted files(14).
ERROR: Failed to read content of "res://scenesBlackMountain.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesCave1.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesCave3.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesCave6.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesCavernPass.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesCavernWater.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesDungeon1.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesDungeon3.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesPhoenixCave.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesQuarryMine.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesTitle.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesWildeburn.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)
ERROR: Failed to read content of "res://scenesWildeburnAndrew.tscn".
   at: (editor/project_converter_3_to_4.cpp:1631)

@qarmin

Steps to reproduce

Godot_v4.0-alpha12_win64.exe --convert-3to4

Minimal reproduction project

No response

[TokisanGames]

Alright, I'll try again on a fresh copy of my gd3 project and see what else comes up.