[3.6] Loading a resource pack with load_resource_pack() prevents Directory from seeing the res:// folder when launched from the editor

[rwqfsfasxc100]

Tested versions

Reproducible in 3.6.1.stable, 3.6.stable, 3.5.3.stable, 3.5.2.stable, 3.5.1.stable, 3.5.stable, 3.4.5.stable, 3.4.4.stable, 3.4.3.stable, 3.4.2.stable, 3.4.1.stable, 3.4.stable

System information

Windows 11 - Godot 3.6.1.stable - GLES3 - AMD Ryzen 5 7600X processor - AMD Radeon RX 9070 XT graphics

Issue description

When launching from the editor after loading a resource pack through ProjectSettings.load_resource_pack(), and trying to query the res:// folder with Dictionary.dir_exists("res://") returns false, despite it returning true before the load_resource_pack operation. This does not happen when compiling the same code into an executable and running the same code through that application.

Steps to reproduce

1. Launch via the editor (play)
2. Query the res:// folder's existence through Directory.dir_exists(). This should return true:

 var dir = Directory.new()
 var does = dir.dir_exists("res://")

2. Load a resource pack (does not matter if .pck or .zip):

 ProjectSettings.load_resource_pack(C:\path\to\resource\pack.zip)

3. Retry the same query on res:// as before. This will now return false:

 var dir = Directory.new()
 var does = dir.dir_exists("res://")

Minimal reproduction project (MRP)

load_resource_pack test.zip

[bruvzg]

For the reference, this should be fixed in 4.x by #90425

[rwqfsfasxc100]

unfortunate, the project i'm working on can't be feasibly ported to 4.x, and I don't really have a way around it either.

Don't know if this could be backported by anyone maintaining 3.x, but that's at their discretion really