Are you using the latest ver. of Antitest?
I downloaded it and on ESSP, it was first caught by LiveGuard,; scanned in the cloud; and deemed safe. The latest ver. is dated 9/16/2021. The fact the .exe was scanned by LiveGuard is indicative of Eset never seeing it previously.
Running Antitest on Win 10 using Firefox and B&PP in ESSP, all keystrokes were scrambled.
What I am suspecting is the version of AntiTest you are using is not compatible with Win 11.