One that it objected to was

CPH-MAD-TLV-LHR-MEL-HKG-NRT-SIN-SFO-JFK-DFW-CDG-CPH

Note that SIN-SFO requred doing SIN-HKG-SFO with different flight numbers.

It wasn't the limited stopovers in Europe that were the problem as TLV-LHR-MEL and CPH-MAD-TLV were both done with less than 24 hours between flights, so those errors went away.