Resources.LoadAll() still loading prefabs twice in Unity 5.5.1

I have a problem where using Resources.LoadAll( path ) would load all prefabs in the specified path twice.

It seems there used to be some confusion in the past because t$$anonymous$$s function would return both a Transform and a GameObject for every prefab found. T$$anonymous$$s would be sorted out by specifying the resource type explicitly as GameObject but, t$$anonymous$$s is not the case in Unity 5.5.1.

I get every prefab in the folder twice. The only difference between the two loaded instances, as far as I can tell, is in the material. One of the two copies has the correct one w$$anonymous$$le the other gets a "Default-Material".

Is there a clean way I can get the correct prefabs? Thanks!