connecting different capacity batteries in paralell
It's not nice.

You have 12 cells, all at 4.2V, and you're drawing 10 out of the pack. They start out equal, and all provide 1/12th of current. As the lower capacity ones discharge, they drop their voltage faster than the higher capacity ones, and so start contributing less current. This pretty much self balances if all the cells are identical other than capacity.

This never happens because no two cells are identical, if they are different capacities they are even more different, especially with their voltage discharge curves and internal impedance and so will perform very differently.

In the real world, the different cells output different currents, probably causing significantly different "off-state" voltages, which would cause the higher capacity ones to charge up the lower capacity ones in some uncontrolled way.