Link/append code needs proper access to scene/view3d data to handle collections/objects instantiation. Note that this is a temporary hack more than a proper fix, which would require a deeper redesign of drag&drop code. Also note that this will not handle 'properly' (i.e. as user would expect it) cases like implicitely appended parent objects, in that only the explicitely appended object will be dropped to the nes location, the others will remain at their original coordinates. Differential Revision: https://developer.blender.org/D12696