When Hyper-V machines fail to start with error 32791

Today, after upgrading the configuration version of a Hyper-V virtual machine, I found that it would no longer start. Specifically, it just gave the error number 32791. I consulted the Admin event log under the Hyper-V-Worker category and found event 12010, which gives a more useful error:

"The chain of virtual hard disks is corrupted. There is a mismatch in the identifiers of the parent virtual hard disk and differencing disk."

Googling that error message brought me to a useful blog post. My virtual disk was already as small as possible, but forcibly re-linking the snapshot (AVHDX) to the parent VHDX fixed the problem. That step can be accomplished by clicking Edit Disk in the Hyper-V Manager, opening the AVHDX, choosing Reconnect, and checking the box that says Ignore ID mismatch. There is a warning about possible data loss, but since I legitimately had the correct, most recent differencing disk for the main virtual disk, no data loss occurred.