I use the out-of-the-box P-Trap family. When I used this Family in 2018 Revit, I modified the annotation lines of the family to be on a Subcategory so that I may toggle the visibility of said lines in other views. I just recently started using 2020 Revit and realized the lines do not show in Plan View. I did extensive testing and deduced that something changed in the way Model/Symbolic Lines behave in Plan from 2018 to 2020.
I challenge anyone else to test this. Take a Fitting in 2018 plan view, Edit Family, put all Model/Symbolic Lines on a new Subcategory and load into project. It will show fine. Now do the exact same procedure in Revit 2020 and the lines will disappear in plan view. It's almost if Revit now does not like lines within a family to be on their own Subcategory.
Why did this change? It is frustrating because this family worked fine in 2018 and now does not work in 2020 and I do not see any work around. I need the lines in this Family to not be under the veil of the Pipe Fittings Subcategory. I need them to be on their own Subcategory to toggle their own respective visibility and not turn off all Pipe Fittings.
Edit: It seems that the lines show fine in Plan if the fitting is parallel to the Plan but if the fitting is rotated so that it is perpendicular to the Plan (as P-Traps are) the lines disappear. Doesn't make sense.
