I'd ask this 1st, why are you trying to run a BETA version on a live production site?
It's called a BETA for a reason.
If the columns are missing, i would view the upgrade php files starting with the one after your old version 3.8.4, view each php upgrade script from that point on in a editor and search for those keywords, see what queries were supposed to be run and compare them to your db, most likely 1/2 of the upgrade queries weren't ran.
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