I have tried to look closely at this, but couldn't really tell. It does behave like the ABS is glopping up as it comes out on the longer threads. But it doesn't do this on the shorter threads??

The cone of my hot end does have some ABS stuck to it (the result of an unfortunate break in USB comm's in the middle of a print). But as best my eyes can tell that stuck-to-cone ABS is not contacting anything on the print.

Jim