I am not sure how you have your machines set up, but logically, the setup is impossible if you are calling your home position that location where the switch opens. You should not. You should home to a given number of steps from where the switch changes state again. This will allow the continuity of the circuit to home another axis in sequence.
For machines with encoders, they never home on something as crude as a switch opening. That is merely a signal to mark the approximate position, after which the encoder index is sought in a given range from the switch break.
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