I've been seeing this for a while, but now I have Creator 4.10.0 and Qt 5.13.1. It happens in Assistant too. Let's say you search for qintptr to see what type that is... it shows up in the index, but clicking the link takes you to The Animation Framework. Same thing if you search for qRound, qMax etc. (It feels like rick-rolling because it's always that page. Never gonna give you up, animation framework... the best part of Qt ever.) Maybe we need a special page like a 404 page for missing docs, with a link to bugreports for users to report missing docs? or something. Anyway there are docs for qintptr in qtbase/corelib/global/qglobal.cpp so the more specific bug is that it doesn't find them; but a better fallback page would also be good to have.