I too have the strobing issue on output videos regardless of length, resolution or type.
AMD Ryzen5 3400G, 12Gb RAM, Windows 10 fully updated.
I reinstalled from latest version to 10.18 which seems to have resolved the problem.
Good to know you are on top of this issue. I have been using your excellent products for quite a few years and frequently recommend them to others. I will monitor this thread and when the issue is resolved will re-upgrade as appropriate.