This stretch of northbound Conestoga Parkway goes under a highway overpass connecting southbound Conestoga Parkway to Hwy 8. Based on your note here and your other edits (namely, to the southbound Conestoga Parkway), I suspect you may have misinterpreted the second Street Complete quest to be asking about another stretch of the same highway, when it was one quest for each direction, which are mapped as separate ways. I went ahead and in https://www.openstreetmap.org/changeset/157015705 added the same maxheight tag as you added to the southbound direction in https://www.openstreetmap.org/changeset/155711043 (but didn't tag it as unsigned, since that's not visible from aerial imagery).

If I'm wrong and you still think there's a layering issue, reopen this and I'll take another look.