Latest Fedora Silverblue on external SSD on Windows 11 Pro laptop not booting


Very happy Fedora Silverblue user. I created an installation on an external SSD and that works perfectly on my Linux laptops (2 x). But on my Windows 11 Pro laptop it gives problems (does not boot). I have come so far to conclude that it has to do with Grub2 (it cannot be anything else). The Windows11 Pro laptop just restarts, so the menu does not appear. How to fix? Here screenshots of my Fedora folders. Thank you for your help!