I try to install kde-plasma 5.11 beta(5.10.95), but always fail when downloading source code package. I found the regex to detect unstable kde-plasma failed when the minor version up to 2 digits. https://github.com/gentoo/kde/blob/master/eclass/kde5.eclass#L348
Fixed in https://gitweb.gentoo.org/proj/kde.git/commit/?id=1e3aa43876a04d604758a3287945afbf76ed4a0a