Maybe also useful to be mentioned:
Avast Free ed.
Malwarebytes Premium
Get rid of Avast.
Just to add to this, perhaps Avast has not updated their code to work properly with 20H1. You will have to uninstall Avast with their removal tool, not just disable or uninstall. Perhaps talk to Avast support regarding this. Once removed, please let us know if things are working properly.
Many users reported no issue running Malwarebytes. You can keep using this.
Regards,