EAPI 8 is announced for a while, however unpacker.eclass now only supports EAPI 5 6 and 7. It is a common eclass and EAPI 8 removes support for 7-Zip, LHA and RAR formats, and other formats(e.g.: deb) need this eclass. Reproducible: Always
Solved. https://gitweb.gentoo.org/repo/gentoo.git/commit/eclass/unpacker.eclass?id=64a5f18e204ef2eb98abc2814956f78d340d7986