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According to the documentation that you linked, the md5 text is defined as:
[..] the .msg text with:
- comments removed
- whitespace removed
- package names of dependencies removed
- constants reordered ahead of other declarations
And for composite messages: "the MD5 text is concatenated with the MD5 text of each of the embedded types, in the order that they appear."
So only the text is concatenated. The MD5 sum itself is not part of what is defined as the md5 text.