As you see WoW/battle-net app doesn’t delete/update/reset their cache files
and when you uninstall battle-net app, it doesn’t delete the cache/settings, you need to delete those folders/files after uninstall.
Follow Deleting cache/setting for Battle.net app/program part of my guide below https://eu.forums.blizzard.com/en/wow/t/comprehensive-guide-for-blzbntagt00000bb8-scan-loop-for-low-bandwidth-internet/416779