3D View shows ghosted/duplicated UI when docked

Hi,

In Substance 3D Designer 16.0.4, the 3D view is not repainted correctly. When it is docked, its menu bar (Scene, Materials, Lights, Camera...) and toolbars are repeated and stacked on top of each other, and part of the viewport is white. When I maximize the 3D view, the smaller previous version stays visible behind it, so it looks duplicated. The graph and the 2D view render perfectly. If I float the 3D view in its own window, the menus are clean, but the viewport area is transparent (I see the graph through it) and no 3D image is drawn.

The problem happens on both my laptop screen and my external monitor. I have never had this issue with any other 3D software, including Substance Painter.

Configuration:
- Windows 11
- Acer Nitro 16, AMD Ryzen 7 7735HS, 32 GB RAM
- NVIDIA GeForce RTX 4070 Laptop GPU, NVIDIA Studio driver 617.42 (clean install) + AMD Radeon 680M iGPU
- External monitor: Asus

What I already tried, without success:
- Rasterizer and OpenGL renderers: same glitch with both
- "GPU Pathtracer" is greyed out as "Not supported", even though the RTX 4070 should support it
- Designer set to High performance (RTX 4070) in Windows graphics settings
- NitroSense GPU mode set to "NVIDIA GPU only" (iGPU disabled), then restart
- Same display scaling (100%) on both screens
- Disabled "Optimizations for windowed games"
- Closed overlays (Discord, Steam, NVIDIA App overlay, etc.)
- Deleted the registry key HKCU\Software\Adobe\Adobe Substance 3D Designer, and reset the layout
- Clean installation of the latest NVIDIA Studio driver

Screenshots are attached. Is this a known issue, and is there a workaround or a fix planned? I can provide logs or test builds if needed.

Thank you!