Due to systemd limitation causing regression on AD managed systems, fix for CAP_WAKE_ALARM provided in Plasma 6.4.0 release was partially reverted in powerdevil. If your distribution wants to provide support for alarm wakeups from suspend on Plasma Mobile device, Please manually override plasma-powerdevil.service systemd user unit to pass CAP_WAKE_ALARM in AmbientCapabilities.
Went looking for the bug report out of curiousity. Seems like a Fedora only bug.