sys-apps/systemd-234-r4 contains a bug where it tries to mount the /usr partition to /sysroot/sysroot/usr instead of /sysroot/usr: https://forums.gentoo.org/viewtopic-p-8098458.html Upstream commit 98eda38aed6a10c4f6d6ad0cac6e5361e87de52b fixes this: * https://github.com/systemd/systemd/pull/6411 * https://github.com/systemd/systemd/commit/c7b2630c9154722e2295f3dbfbb19f3305676ecf.patch
Please upgrade to 235.