I am not sure if you meant that the new automatic importer will get only the scrobbles or the loved tracks as well, because there is still a button for manually retrieving the loved tracks. I tried that and just like @guckuck above i got a partial retrieval.
If it helps, I tried this method a few times in different days and got the same 23 of 50 every time. Interestingly, roughly the same percentage guckuk got even with my set being 7x smaller.