Since December, Calculate’s sys-auth/elogind package is not creating 73-seat-late.rules. This prevents cameras, game controllers, and other peripherals from hotplugging after login has completed.
Elogind bug (Filed December 2020): Device permissions not being set on device plugin. · Issue #186 · elogind/elogind · GitHub
Have confirmed this bug does not exist upstream in Gentoo. If I build the package from source, 73-seat-late.rules is built. Have also confirmed that Calculate’s binary does not contain the file, has not for months, and affects all installs of Calculate.