Wihch side needs to know the situation?
I don't have my rule book with me today, so caveat emptor.
Speaking ASA, the rules now place equal onus on both the offense and the defense to know the game situation. Therefore, in the situation you describe, the mere running to first by the B(R) does not consititute interfence. If the catcher throws to 1st in an attempt to retire the already retired, then you have a DC (dumb catcher).
On the other hand, if the B(R) makes an obvious move to try to get in the way of a pickoff attempt on the runner, then you have interference.
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