squeeze-proposed-updates contains lenny packages

[Thilo Six <T.Six@gmx.de>]

Hello

i am wondering why squeeze-proposed-updates contains lenny packages like e.g.:

$ apt-cache policy linux-headers-2.6.26-2-amd64
linux-headers-2.6.26-2-amd64:
  Installed: (none)
  Candidate: 2.6.26-26lenny2
  Version table:
     2.6.26-26lenny2 0
        500 http://ftp.de.debian.org/debian/ squeeze-proposed-updates/main amd64
Packages

Is this a bug and should be reported or this intentionally?
-- 
bye Thilo

4096R/0xC70B1A8F
721B 1BA0 095C 1ABA 3FC6  7C18 89A4 A2A0 C70B 1A8F