Input issues with Input in Subviewport in main_screen Plugin

Help
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1

Godot Version

4.3

Question

Hi, I am currently building a gdscript plugin with a main screen scene looking like this:
image
The Idea is to have a viewport i can scroll around in similar to the 2D scene editor.
The problem im facing is that inside of the SubViewport no input events are registered. When launching through “run current scene” everything works fine though.
Disable Input on the viewport is off.
I tried both with Handle Input Locally on and off.
I tried setting focus to the viewportContainer or a node inside but it didn’t seem to do anything.

Any Idea what im missing?