Unable to edit the hard disk properties because it has one or more snapshots, but no snapshots

I am attempting to change the hard disk size of my Windows virtual machine, but get a popup stating
"Unable to edit the hard disk properties because it has one or more snapshots.
To edit the disk properties, "Windows 10 (1)" must have no snapshots."
However, when I follow the "Manage Snapshots" prompt there are none to delete. I see from other threads that this is a longstanding issue. I've attempted the solutions from this thread and this thread, with no change.