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What version of simple-cdd?
Are you pointing simple-cdd at the same debain release as the version of simple-cdd you are using?, or an older or newer version of Debian?
Is the issue repro-ducable pointing simple-cdd at a different version of Debain than the one you get the mismatched hash from?
If you can answer those qiestions someone will tell you if it's a bug or something else.
In memory of Ian Ashley Murdock (1973 - 2015) founder of the Debian project.