=== Amend to compat=0.10 ===
qemu-img: compat=0.10 requires refcount_bits=16
-qemu-img: Error while amending options: Operation not supported
refcount bits: 64
No errors were found on the image.
refcount bits: 16
refcount bits: 16
-qemu-img: Different refcount widths than 16 bits require compatibility level 1.1 or above (use compat=1.1 or greater)
-qemu-img: Error while amending options: Invalid argument
+qemu-img: Refcount widths other than 16 bits require compatibility level 1.1 or above (use compat=1.1 or greater)
refcount bits: 16
=== Amend with snapshot ===
wrote 16777216/16777216 bytes at offset 0
16 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
qemu-img: Cannot decrease refcount entry width to 1 bits: Cluster at offset 0x50000 has a refcount of 2
-qemu-img: Error while amending options: Invalid argument
No errors were found on the image.
refcount bits: 16
No errors were found on the image.