Common descent predicts there will be TRGs at several levels of the taxonomy. “Primordial bees” is poorly defined, so you can’t make clear predictions about it. We expect TRGs before and after the first “bees,” however we define them.
Why would they be worthless?
Something like 90% of bee species are solitary, and responsible for pollinating most of the food we eat: https://www.greenandblue.co.uk/blogs/news/5-things-you-need-to-know-about-solitary-bees
So whatever is TRG to bees as a whole is not likely the cause of the social behavior you are envisioning.