SubViewport doesn't seem to inherit size form the SubViewportContainer in Godot 4.0

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:bust_in_silhouette: Asked By YangTegap

I’ve got a basic control scene including an HSplitContainer with a panel on the left and a SubViewportContainer with a child SubViewport on the right. However, the size seems to need to be explicitly set for the SubViewport regardless of the container’s size. Is there a setting or something that needs to be flipped on that I’m missing?