The feature to install packages in the DUT without a package manager uses function in the package manager lib that are not used in any other place, so a change in the library might silently broke the feature without any error in the autobuilders.
Patch sent to the mailing list: http://lists.openembedded.org/pipermail/openembedded-core/2016-June/122785.html
This has been solved with commit: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=f31683d5ba65163b73c25c84fa537387233d2215