HSplit cursor gets stuck in Advanced Scene Importer when hovering 3D preview

[SaracenOne]

Godot version

06d5189

System information

Windows 11

Issue description

When highlight the split container, the cursor will change the HSplit cursor, but will not return back to normal if the cursor then moves over into the 3D preview until the cursor is taken completely out of it.

Steps to reproduce

Open advanced scene importer.
Highlight draggable left or right edge of 3D preview.
Move cursor into 3D preview.

Minimal reproduction project

N/A

[akien-mga]

Confirmed reproducible in 4.2-beta5 and e5bacbc.

To clarify, this is a regression in 4.2, the bug doesn't reproduce in 4.1.2-stable.
The regression was introduced in 4.2-dev2 by #79805. CC @kumikumi @Sauermann