On fresh installs on all my B550 based boards I get through the Ist phase and then it rebooted and the screen is dark with a blinking cursor in the upper left side.
I was loading an Asus x570-PLUS with the same situation. The way it worked was to use the bios to set the boot device to the USB and then on first reboot change the boot device back to the boot drive. I also had to change the ACPI line in the config.sys to remove the /VW before the first reboot for the install to see the USB. This was new behavior from earlier versions.
On my system with 7 sata connections I had to remove all the sata connections except the boot drive sata connection for the install to recognize drive C: Once installed the other sata connections were connected again and worked. This was the same as earlier versions.
Another new item was the ArcaOS splash screen last a lot longer than in the past.