dnd 5e – if i use the twinned metamagic to wish and the two targets Contingency, what will happen?

if i cast wish wish twinned spell metamagic, an both wish target Contingency, what will happen? both disappears or can keep both?

my doubt: “You can use only one contingency spell at a time. If you cast this spell again

if the two are conjured together they will not trigger because you not cast anymore when this effect goes to stack?