Setting control node to pass and overriding _gui_input does not work

[Nukiloco]

Godot version

v4.0.alpha.calinou [caa9ec8]

System information

Windows 10, Nvidia GTX 750 TI, Nvidia GTX 1050 TI

Issue description

From what I understand from the documentation on gui inputs:

Stop captures the mouse input events and doesn't allow them to pass on.
Pass captures the mouse input events but if its not accepted then it passes it on.
Ignore ignores the mouse input events and pass them on.

However in the reproduction project I have below, this doesn't seem to be happening with the Pass event.

Steps to reproduce

Download the reproduction project below, press F5 and run the project. Hover your mouse over the button and notice how its not being highlighted and that you can't click on it.

The main scene in this project is setup where all the control nodes are set to Ignore except...
Button which is set to Stop
Panel which is set to Pass

You will see that the Panel node has a script attached to it. In this script you can see that _gui_input is overridden but does not call accept_input at all. From my understanding, this should allow the input to pass into the Button.

Minimal reproduction project

GuiInputPassIssue.zip

[Sauermann]

In your MRP, you want to pass the event to siblings and not to parents. This is currently not possible and what you experience is expected behavior.
This proposal summarizes the current situation: godotengine/godot-proposals#3613