Hi,
nobody seems to have asked yet, but is the Media Creation Tool the latest, or you just used an old copy, you had on your legacy PC? Windows on Ryzen can't be installed using older installation media, because Microsoft didn't include the new chipset drivers while AMD was dormant in the CPU market.
Moreover, I've encountered your issue before myself, and usually it took only a couple reboots to get it into the installer. In my case it was the USB drive that occasionally got stuck during the boot process, while it worked pretty fine with everything else. As some have already suggested, using a different USB drive might solve the issue.
You can also try installing in UEFI mode. UEFI requires the USB drive to be formatted as FAT32, but sometimes motherboard manufacturers allow you to use exFat, too (it's not standard though). That's because a standard 64-bit media won't fit on a USB drive due to the 4GB file size restriction enforced by FAT32. You can go around that with 2 USB drives though. One formatted as FAT32 with the whole media content on it without the install.wim file, while the other formatted as NTFS with just the install.wim file inside the "sources" folder. Once the boot process is complete and you enter the setup screen, but before you click anything, just switch the USB drives and the installation will proceed without issues. You can either use Rufus or DiskPart to prepare the USB drive/s for the task.
I hope it helps, but before anything, update the BiOS firmware.