[2.0.69] Smart belt dragging issue

[Lenskop]

When dragging belts over existing sections, a section is removed.
When undoing the action, an underground is placed instead of the section that's removed.

I think the section should not be removed upon building, and when undoing the action all belts should be returned to the initial states.

The behaviour is persistent, see attached video for reproduction.

Factorio - 2025-10-03 09-00-12.mp4

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