This is the very first time that we're seeing this kind of issue , Could be your settings prior to antivirus and etc , We highly recommend to not use windows 11 for gaming as it is not reliable.
Greetings , Make sure to launch steam and run dota2 once , Then run melonity as administrator and check for the issue , Incase problem remain please read our article prior to disabling windows security , firewall and antivirus ...
Hello , Please read this article , We've detailed instruction how exactly you can rework the melonity launcher : https://forum.melonity.gg/threads/launcher-loading-problems-solutions.395/