If you need a workaround for a similar issue due to systemd update you can copy https://github.com/yuwata/systemd/blob/5286da064c97d2ac934cb301066aaa8605a3c8f9/rules.d/60-serial.rules over /usr/lib/udev/rules.d/60-serial.rules.
It seems like in systemd a bug that was fixed in a newer version has now also been introduced to an older version, see here: Reddit - Dive into anything
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