Thanks for confirming. My b4 to b5 seed system software update isn't working as expected. Something weird. From b3 to b4 system update kicked in automatically, popped up a few dialogs, restarted and (of course) I post-installed for the requisite fixes. (relatively) smooth. I was kind of hoping it would follow the same route. I shouldn't need the beta utility at all. In fact, when installed on Mojave, all beta utility does is download the full installer which (of course) doesn't recognize my system as legit unless I create a new patcher stick with it. Strange.
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@dosdude1 and
@0403979
Don't know if this helps... From Apple's release notes.
Apple File System (APFS) Known Issues • After enabling or disabling FileVault, the volume will become invisible to pre-macOS Mojave systems until the encryption or decryption process completes.