Normally you wouldn't notice this problem because the "White Flash" only appears for a moment.
This is a problem that exists in all builds, not just in Beta or Experimental.
I understand your problem. Sorry, English is not my native language. I can reproduce your problem.
This seems to be an issue with MCT creating the image. Could you try downloading the ISO file directly without MCT?
Downloading the ISO file directly without MCT and uses Rufus to create USB...
It looks like you've enabled SVN, which might be a problem. I haven't enabled SVN yet because the mechanism is too strict, and Microsoft hasn't enforced it.
Have you updated your USB media?
https://support.microsoft.com/en-us/topic/updating-windows-bootable-media-to-use-the-pca2023-signed-boot-manager-d4064779-0e4e-43ac-b2ce-24f434fcfa0f
Check your (USB)X:\efi\boot\bootx64.efi use the PCA 2011 or CA 2023 signed boot manager.
So why do you need to repair Windows? It's unclear how you would use it. Perhaps you shouldn't Revoked PCA 2011 too early, as it remains an optional step.
I tested. No issues. I have revoked PCA 2011. Uses new Installation Media boot. Select the repair options > Displays the menu. No problem. (Disc Image: 26200.8457)