Easiest way to fix this issue is to upgrade your iso.
I had the exact same issue with the default 1909 task. After replacing the iso with a new one , for example this one - “en_windows_10_business_editions_version_1909_updated_oct_2020_x64_dvd_3cfd51ef.iso” the issue was fixed.
Simply copy the task and change the action script so the action script runs the new iso instead of the old one.
P.s you will also have to calculate a new sha1 and sha256 for the file.
Let me know if you need more help.