I'll admit I was lazy when packing the archive and used KDE's Ark, because I still haven't made a script that prepares it for me. Will do that for the next release though.
Should be fixed in the 0.31 release, feel free to reopen if the issue persists.
When unpacking the released archives, at least on Manjaro and Arch, this pops up:
Apparently it's due to the archives having been done either with bsdtar or another version of tar supporting some extensions no longer supported by upstream GNU tar (http://bugs.rosalinux.ru/show_bug.cgi?id=712 )
So, a very minor issue, as it breaks nothing.
But I'm curious now... how did you pack the archives?
I don't think this warrants a "repackage" of the existing files, but it could be taken into account for future releases.