Packages.gz priority different from package priority

Hi,

hope this is the right place to report this bug.

While playing with a jessie amd64 mirror I observed some discrepancy
with debootstrap. When using the official mirror the package nfacct
ends up installed, while it is missing when bootstrapping from a local
mirror.

While the package has priority: extra [1] it is listed with priority:
important in current Package.gz [2] for jessie/amd64 (and thus gets
installed by debootstrap, I guess). The checksum in Package.gz is
correct [3].

Best regards
Roland Lezuo

[1] 
$ dpkg -I nfacct_1.0.1-1.1_amd64.deb
...
Version: 1.0.1-1.1
Architecture: amd64
...
Priority: extra
...


[2] 

(636e326126358055ed0acabb93852bf7  9033871 main/binary-
amd64/Packages.gz) as seen on ftp://ftp.at.debian.org/debian/dists/jess
ie/main/binary-amd64/Packages.gz (and also on us mirror).

...
Package: nfacct
Version: 1.0.1-1.1
Installed-Size: 54
Maintainer: Laurence J. Lane <[email protected]>
Architecture: amd64
Depends: libc6 (>= 2.7), libmnl0 (>= 1.0.3-4~), libnetfilter-acct1
Description: netfilter accounting object tool
Homepage: http://netfilter.org/projects/nfacct/
Description-md5: 2e8fa079f18fa788fcfae43ba123bcee
Section: net
Priority: important
Filename: pool/main/n/nfacct/nfacct_1.0.1-1.1_amd64.deb
Size: 7820
MD5sum: 5b0f45070b76b350002743c8edf170fc
SHA1: fcfe129d03e513da836e7985b6924be0f1b9ba0c
SHA256:
8747209f5181fa70c012cf81bec959460d1a4a5763fa38cd50b5b5a4a6cfaf48
...

[3]
$ md5sum nfacct_1.0.1-1.1_amd64.deb
5b0f45070b76b350002743c8edf170fc  nfacct_1.0.1-1.1_amd64.deb

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