There'll be no bug report on systemd because the applications involved are likely already using some other system. E.g. DBus IPC.
If it used DBus IPC then it can be easily be used with systemd thus error report will be entirely unnecessary. I've said "convert it to signals systemd understands" and not "convert it to socket activation" exactly for this reason: because systemd handles many different activation requests and makes sure they don't conflict. Socket activation is just one of them (even if one of the most important ones).
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