As said in the title, I'm not *certain* if its a bug, but the non-winter variant of "CUP_Winter_obj_Wreck_Ship_1" (the one that appears in Porto and the Summer and Autumn versions of Chernarus, as well as an extended portion of the aforementioned wreckages) do not seem to be available in object form, and do not appear when searching for it in the object finder or asset finder.
Only the bow section of the winter version is available as an object.