When unit_need_daemon_reload() calls unit_find_dropin_paths() to check for new drop-in configs, the manager's unit path cache is used to limit which directories are considered. If a new drop-in directory is created, it may not be in the unit path cache, and hence unit_need_daemon_reload() may return false, despite a new drop-in being present. However, if a unit path cache is not given to unit_file_find_dropin_paths() at all, then it behaves as if the target path was found in the unit path cache. So, to fix this, adapt unit_find_dropin_paths() to take a boolean argument indicating whether or not to pass along the unit path cache. Set this to false in unit_need_daemon_reload(). Fixes #31752
System and Service Manager
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