Alpine Linux for Raspberry Pi won't boot on 3 B+ model

Steps to Reproduce

1. Obtain a Raspberry Pi 3 B+
2. Download the aarch64 image for Alpine Linux under the Raspberry Pi section
3. Use the Raspberry Pi Imager tool to flash the image onto a microSD card (I'm using Windows 10)
4. Attempt to boot the Raspberry Pi

Expected Result

Alpine Linux boots.

Actual Result

Nothing happens. Monitor stays off, the activity indicator LED on the Pi stays off. The power LED illuminates.

Notes

• The same physical Raspberry Pi device boots Ubuntu Linux ARM 64-bit Focal Fossa. Ruled out possibility of bad hardware.
• Tried using two different microSD cards:
  • Samsung EVO Select 64GB
  • SanDisk Ultra Plus 64GB
• It appears that perhaps the Raspberry Pi Imager tool is not a supported mechanism of flashing the image. Just found the Alpine documentation for Raspberry Pi. What that in mind, is there a supported way to create a bootable partition on a microSD card from Windows 10?