Clicking a button in the scene dock while a project is loading causes current scene to be overwritten

[timcode77]

Tested versions

v4.2.1.stable.official [b09f793]
v4.2.2.stable.official [15073af]

System information

Windows 11 Home Godot Engine v4.2.1.stable.official.b09f793f5 Vulkan API 1.2.170 - Forward+ - Using Vulkan Device #0: Intel - Intel(R) UHD Graphics

Issue description

When a project is loading, the scene dock appears and if you click a button before the last opened scene is fully loaded, the loading scene will be completely overwritten with a new scene. This is irreversible without rolling back to a previously saved version. No undo is possible. This bug is more apparent when projects / scenes are large and hence take longer to load (giving you more time to click a button by accident!)

Haven't tested in 4.2.2 but this problem has been present since at least 4.0 so I'm assuming it's pervasive across versions.

Steps to reproduce

1. Open a large project that is slow to load on your system.
2. As the current loaded scene is loading, click "2D Scene" in the Scene Dock.
3. You will notice that the current scene has been overwritten by a new "empty" scene with nothing but a Node2D.

Minimal reproduction project (MRP)

I cannot provide this because what is slow to load for you will be dependent on your system. Additionally, it wouldn't be practical to upload a large project for merely the purposes of providing you something slow to load. Bug is not project dependent.

[AThousandShips]

Can you try in 4.2.2?

[timcode77]

Can you try in 4.2.2?

Ok I've tried it. The problem is still there. I updated the original report to include 4.2.2.