Why does an additional tapered extrude on this spindle result in isolated face ?

 From:  svenster
11189.1 
Hi Forum. Trying to figure out why if I add an additional taper section to this cylinder ( select smaller face>extrude>tapered>distance 4mm) I end up with face without the taper visible unlike the previous taper on same cylinder. I can make an identical cylinder without incident without the bearing so I'm guessing it has to do with interplay.

Sven