3D assets lose surface placement when Ctrl snapping is enabled during drag-and-drop

[Bat-Computer]

Tested versions

Reproducable in v4.7.stable.official [5b4e0cb]

System information

Window 11, Godot v4.7.stable.official [5b4e0cb]

Issue description

Godot has a feature for placing models on a sufrace when there is a collision shape on the model.
However this feature appears to be dissabled when dragging a model and temporarily pressing CTRL to snap your movment.

Steps to reproduce

1. Create a 3D scene.
2. Add a CSGBox3D and enable collision.
3. Drag a GLB/FBX model from Godot's FileSystem dock into the 3D viewport.
4. Move the cursor over the CSGBox3D — the model correctly sits on its surface.
5. While still dragging, hold CTRL to temporarily enable snapping.
6. The model immediately loses its surface-placement offset and sinks partly into the surface.
7. Release Ctrl and surface placement works correctly again.

Minimal reproduction project (MRP)

snap-floor-bug.zip