Why is my LaCie Rugged BOSS SSD not detected on my USB-C iPad Pro?

iOS 13.5.1:

With the latest update to iOS, the USB-C iPad Pro may not detect the Rugged BOSS SSD when it is plugged into the iPad. We are currently working with Apple on a fix for this issue. This only occurs when the BOSS SSD is in battery mode. If you need to use your BOSS SSD with a USB-C iPad, you can use a temporary workaround by plugging the BOSS SSD into power using the included AC adapter. More information will be released on this page when an update is available.