I'll take mdz's comments as confirmation. If it does do this then it is wrong; the permissions should be sane and in particular g+s on directories should take effect and be inherited.
** Changed in: dpkg (Ubuntu)
Importance: Untriaged => Low
Status: Unconfirmed => Confirmed
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dpkg-source doesn't respect group sticky bit
https://launchpad.net/bugs/51468
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