I have a DAL plugin that has been working well in sandboxed apps for some time but since Mojave (or perhaps a Flash player upgrade?) the assistant process fails to launch on Flash-based sites with this sandbox error:
Sandbox: com.apple.WebKit(2639) deny(1) mach-lookup my.bundle.name
The call I'm using is:
xpc_connection_create_mach_service("my.bundle.name", nil, XPC_CONNECTION_MACH_SERVICE_PRIVILEGED);
Note that this does not happen with Chrome, which I believe has its own build of the Flash player.
I know Flash is dead but I'm hoping that there is a solution to this problem as many sites are dragging their feet on moving away from Flash.