If they outputs are tied together to the input it works. That indicates to me they are not both trying to talk at once.
I also tried a diode or gate (web says pull down at OR gate output). No joy there too.
If they outputs are tied together to the input it works. That indicates to me they are not both trying to talk at once.
I also tried a diode or gate (web says pull down at OR gate output). No joy there too.