Hi there, hold down the power button and volume down button at the same time to return to the bootloader interface. You can then try flashing the release again.
When your phone was at fastbootd, the installation failed. Now you're in a boot loop because you tried to boot into the OS, before the OS had finished installing.
It is most likely that the flash failed due to a USB connectivity issue. I recommend that you use a USB-C to USB-C cable, ideally the factory one from Google.