Problem with amphibious units

[Flux]

When I turn a unit's collision off and add Ghost (Visible) ability to it, ground units can walk through it. However, why does amphibious units cannot walk through that unit but it can run through the amphibious unit.

Look at sample map for clarity.

 

[Death Adder]

The mountain giant can both walk through and be walked through by any of the units placed for me.

 

[Flux]

The mountain giant can both walk through and be walked through by any of the units placed for me.

Try selecting amphibious units.They can't walk through to the Mountain Giant

 

[Death Adder]

wow that's spooky, I'm pretty sure I had the naga myrmidion walk through the Mountain Giant last time. (but indeed both of the nagas were unable to, this time)

edit: Found someone else has had the same problem, with seemingly no simple solution; http://www.hiveworkshop.com/forums/world-editor-help-zone-98/collision-size-amphibious-units-213408/

 

[Flux]

Ohh ok. Thanks for your effort.