Github user wido commented on the issue:
https://github.com/apache/cloudstack/pull/1645
What I see to remember somehow is that the management server/code always
thinks a snapshot is in the same format as the base image was.
So when you try to do something with this snapshot it still thinks it is
RAW since that's what the original volume is.
For a snapshot there is no additional field saying that's QCOW2 and not RAW.
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