Use bee cage to catch bees, it will be automatically converted into creeper bee.

Version productivebees-1.15.2-0.5.1.2.jar

Tracked here mahjerion/Craft-to-Exile-Dissonance#173

I am unable to recreate it, but I am having some trouble with bees caught in the bumblezone. Can you try with vanilla bees from the overworld and see if you have the same problem?