Think I MAY have figured out what's happening. It would seem that maybe Serums that have been cloned by the cloning machine don't count towards Testing a serum when used or given to another Sim. I would usually make a brand new Serum once I got the recipe, and then immediately clone a bunch of them and use the cloned Serums. Those serums never seemed to become Tested. I started creating brand new Serums and using them directly that way, and now they become Tested with enough use.
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