I have tried to reproduce this on mitaka 9.2, I did:
1. Create volume from image 2. Boot instance from volume 3. Create snapshot from this instance 4. Boot instance from snapshot
Actually I had a 0 image after snapshoting, but #4 worked.
On the other hand I have faced an issue when I tried to create volume from this 0 image.
I have tried to reproduce this on mitaka 9.2, I did:
1. Create volume from image
2. Boot instance from volume
3. Create snapshot from this instance
4. Boot instance from snapshot
Actually I had a 0 image after snapshoting, but #4 worked.
On the other hand I have faced an issue when I tried to create volume from this 0 image.