Just so I'm understanding that reply correctly: you're saying that this was a bug that was fixed in 10.15.6? "Changes in this area" is 100% expected and understood, but did not directly answer whether this is a known issue or if I am using the APIs wrong.
keeen
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@eskimo, thanks for the response. Just so we're clear: the system-extension.install entitlement is not something that is relevant or "known to" Mojave, right? What do you mean by a "constrained entitlement"? What would be intuitive in my mind... is if Mojave saw that entitlement, "knew nothing of it", and didn't kill the app, but that's clearly not how that works.
I am facing the same issue. Does Apple have an official story on how to support an application with a system extension for both Mojave and Catalina simultaneously?