Switching scene to 2D with Gizmo overlay in a dynamic panels leaves the panel open

Steps to reproduce:

1. Open a new project
2. In the scene view, ensure the Gizmo overlay is visible, ensure it's in 3D mode (2D is disabled)
3. Dock it in one of the dynamic panel (alone)
4. Switch to 2D mode

Actual results: The dynamic panels stays open, but empty

Expected results: the gizmo overlays is hidden, and the dynamic panel is closed.

Reproducible with versions: 6.5, 6.4, 6.3

Not reproducible with versions: previous to dynamic panels

Can’t test with versions: 

Tested on (OS): Windows/MacOS

Notes:

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