Upgrading does not properly copy loader properties

[PreLeyZero]

The Bug

When upgrading loaders using nanobots the entities properties are not copied properly. The upgraded loaders have the right direction, but the loader_type is always set to input. This can cause problems flipping loaders the wrong way after upgrading them.

To Reproduce

1. Build loaders (best with no snapping mechanic that could fix this problem) like in the screenshot.
2. Here left side is before and right side after upgrading.
3. Upgrade them via upgrade planner.

Mods like AAI loaders can fix this issue as they can snap after upgrading. However mods with lightweigt or no snapping mechanic will not. Copying https://lua-api.factorio.com/latest/LuaEntity.html#LuaEntity.loader_type should fix the issue.