Uninstalling a specific version of Qt still leaves doc and example files

I have just upgraded to Qt 5.12.3 and asked for Qt 5.12.2 to be removed. I was therefore hoping for all of Qt 5.12.2 to be removed, but this is not the case: the documentation and examples for Qt 5.12.2 are still there. They take quite a bit of space (~585 MB for the documentation and ~165 MB for the examples), so it would be nice to have them (finally) removed. (Indeed, every time I upgrade Qt, I need to manually remove those leftovers, which is a bit annoying).