I think I see what the problem is. This way can only be reached via https://www.openstreetmap.org/way/427762921 
which has a visible 16’4” sign.

Our team is always diligent about ensuring the lowest restriction on a crossing is properly captured. We even had an internal debate about cases like this to determine which value should be tagged. However, since multiple ways are involved here, I can see how not tagging each overpass properly might lead to confusion.

Thank you for pointing out this case—I will instruct the entire team to take it into consideration moving forward.