Reclaim lost (unpartitioned) space on Fusion disk
I believe the commands below will return the free space to your "Macintosh HD" volume.

newfs_hfs  -J  -v  "Recovery HD"  /dev/disk1s3
diskutil  resizevolume  disk1s3  650M
diskutil  unmount  disk1s3
diskutil  cs  resizePV  2110ADEC-ADAD-46C8-AE19-24B589F695E7  0
diskutil  cs  resizeLV  F8F6DA73-C7F8-42FD-AF12-A896F44CD1BB  0