I was able to mount the Guest Additions from 6.0.14, however when attempting to install them, I got an alert:
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"System Extension Blocked": "A program tried to load one or more system extensions that are incompatible with this version of MacOS. Please contact Oracle America, Inc" for support".
What's missing if the Guest Additions aren't installed?
UPDATED: This is weird, but on a hunch, I tried re-installing the Guest Additions from the mounted Box_GAs_6.0.14 ISO/CD -- and this time -- no error!
I was able to confirm that I could move my cursor from my boot Mojave INTO the Mojave Guest smoothly, and back out again. Does that indicate the Guest Additions are, in fact, installed?
UPDATE #2: On further examination, kextstat doesn't indicate any oracle or vboxguest kexts (in fact, no third-part kexts are listed).
I can see VBoxGuest.kext is listed in /LibraryStagedExtensions/Library/Extensions. Perhaps that means the Guest Additions kext wasn't loaded?
Stephen