I cannot see the issue with profile view. But I can confirm the Pipe Centerline from an XREFed drawing uses the layer properties that the XREF resides on and not the properties of the layer that it is supposed to. This bug seems similar to the ongoing bugs in 2018 - 2018.2.
I also noticed that Layer 0 from the XREF takes on the XREF layer's properties. I checked 2018.2 and it seemed to do it as well.
It looks like the centerline for a pipestyle takes on the plot style of the XREF layer, than uses the color of the XREF Layer for display on the screen, but plots with the color of the correct layer. So if you set the plot style on both to black you might not notice it, but if the plot style is Color, then on the screen is shows you the color of the XREF layer, but plots the color of the layer the pipe is on. If you want to screen the pipe, you have to change the plotstyle of the XREF layer to get the center to screen, and then you have to change the layer the object is on to screen the outer wall lines. If you have existing and a proposed pipe networks and only want to screen the existing, you do not seem to be able to.
But we should all be happy because they added some more features in the service pack. :-{) Personally I would prefer Service Packs did not contain new features and "enhancements". They have enough bugs to fix to make any SP a good idea, but the "enhancements" just seem to add more bugs.
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In the above XREF layer refers to the layer the XREF is on, and not a layer in the xref dwg itself.

Boris