### 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)

if (p_property.name == "size") {
		SubViewportContainer *parent_svc = Object::cast_to<SubViewportContainer>(get_parent());
		if (parent_svc && parent_svc->is_stretch_enabled()) {
			p_property.usage = PROPERTY_USAGE_DEFAULT | PROPERTY_USAGE_READ_ONLY;
		} else {
			p_property.usage = PROPERTY_USAGE_DEFAULT;
		}
	}
}
SubViewport::SubViewport() {
	RS::get_singleton()->viewport_set_size(get_viewport_rid(), get_size().width, get_size().height);
}
SubViewport::~SubViewport() {}