Ah, that’s an interesting edge case. I’m aware of this issue but I’m not sure where things eventually landed. If you open a DTS tech support incident (TSI) I should be able to get you a definitive answer.
Once you open the TSI please email me (my address is in my signature) the follow-up number so that I can make sure it comes to me.
Finally, just by way of backstory, in 10.14 we’ve turned on library validation for most system processes as a general security hardening measure. This means that a system process, like the Finder, is not able to load third-party code into its process even if that code is validly signed. There are various exceptions to this rule to keep certain products — both classes of products and, in some cases, individual products — running, and what I’m not sure about, and what I’ll research when I get your TSI, is how things panned out for NetFS plug-ins.
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Quinn “The Eskimo!”
Apple Developer Relations, Developer Technical Support, Core OS/Hardware
let myEmail = "eskimo" + "1" + "@apple.com"