linux-headers-rt-686-pae dependencies vanished from jessie backports

[Magnus Lutz <mlutz@verlinked.de>]

Since yesterday, i get the following error when trying to install the rt linux image from jessie backports (translated from german):

The following packages have unmet dependencies:
linux-headers-rt-686-pae : Depends:  linux-headers-4.6.0-0.bpo.1-rt-686-pae but is not installable
linux-image-rt-686-pae : Depends: linux-image-4.6.0-0.bpo.1-rt-686-pae but is not installable

E: Unable to correct problems, you have held broken packages.

The funny thing is, the package even seems to have vanished from the backports repository, but was still cached as google search result

https://packages.debian.org/jessie-backports/linux-headers-4.6.0-0.bpo.1-rt-686-pae

Is this an error or are there other reasons the package was removed?

Regards,

Magnus