dbus-daemon currently has the following unintended behaviour for system services whose filenames are not the canonical name (the well-known name + ".service"):
* Parse whichever service came first in readdir() order (might be the canonical name, or any other name).
* Silently ignore any others.
* If the one that got parsed has a SystemdService set, use that for activation.
* If the one that got parsed does not have a SystemdService set, use the setuid helper for activation - but the setuid helper will load the file that has the canonical name instead (!), or if there is none, activation will fail.
When Bug #99825 lands,  will at least become a warning.
For the development branch, I think we should consider tightening this to: if the name is not canonical, just fail to load it. After Bug #99825, this would be easy to do.
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