I'm trying to use Thermal Expansion itemducts in conjunction with Genetic Filters from Forestry to automate apiary bee production. I've found that if you set the top "black" filter to "Any Bees" and then the next color in the direction you want to filter things toward to "Anything" that when the apiary input is full of 64 drones, since the Genetic Filter cannot put more drones into the apiary, instead of sending the drones to the "Anything" option it just pops them out of the pipe.

Forestry version 1.12.2-5.8.2.394 in the FTB Revelation pack on the FTB Launcher which also has Extra Bees, Magic Bees and Career Bees.