### Godot version

v4.2.dev.custom_build [c3b0a92c3]

### System information

Debian Linux X11 Xfce

### Issue description

In the following scene tree it is not possible to write anything in `LineEditB`.
![image](https://github.com/godotengine/godot/assets/6299227/ce5f696a-d86a-402f-98f7-6a762f15543e)

I would expect, that it is possible to focus `LineEditB` with a mouse click and write into it.

Regression from #58334

### Steps to reproduce

1. Load and run MRP
2. Mouse Click into the left LineEditB
3. Type Keyboard => No letters appear in the LineEditB

Variant:

1. Load and run MRP
2. Mouse Click into the right LineEditA
3. Mouse Click into the left LineEditB
4. Type Keyboard => Letters appear in LineEditA instead of LineEditB


### Minimal reproduction project

[BugKeyInputRouting.zip](https://github.com/godotengine/godot/files/11994804/BugKeyInputRouting.zip)

ERR_MAIN_THREAD_GUARD;
	if (override_canvas_transform == p_enable) {
		return;
	}
	override_canvas_transform = p_enable;
	if (p_enable) {
		RenderingServer::get_singleton()->viewport_set_canvas_transform(viewport, find_world_2d()->get_canvas(), canvas_transform_override);
	} else {
		RenderingServer::get_singleton()->viewport_set_canvas_transform(viewport, find_world_2d()->get_canvas(), canvas_transform);
	}
}
bool Viewport::is_canvas_transform_override_enbled() const {
	ERR_READ_THREAD_GUARD_V(false);
	return override_canvas_transform;
}
void Viewport::set_canvas_transform_override(const Transform2D &p_transform) {
	ERR_MAIN_THREAD_GUARD;
	if (canvas_transform_override == p_transform) {
		return;
	}
	canvas_transform_override = p_transform;
	if (override_canvas_transform) {
		RenderingServer::get_singleton()->viewport_set_canvas_transform(viewport, find_world_2d()->get_canvas(), canvas_transform_override);
	}
}
Transform2D Viewport::get_canvas_transform_override() const {
	ERR_READ_THREAD_GUARD_V(Transform2D());
	return canvas_transform_override;
}
void Viewport::set_canvas_transform(const Transform2D &p_transform) {