I think Yes!
I don't know exactly what this pass-through charging means.
I couldn't find that out quickly. But if the battery is stressed (which it shouldn't be), it would be harmful to the cells to charge and discharge them at the same time!
Above all, the charging time would increase if you were to do this!
If I were charging a PowerBank and still had to charge something --> I would use a different socket, or find out exactly what pass-through charging means!