The circumstances of "The American Rescue Plan" made me think of this. Suppose a bill passes both the House and the Senate, but with a 50-50 tie in the Senate such that the vice president must cast the tie-breaking vote.
Then, before the president can sign the bill he/she dies, making the vice president now the president.
Is there any constitutional provision, law, or precedent which would imply that the new president could not legally sign the law and make it effective, having previously cast a deciding vote for it?
(I certainly understand that some parties would argue that signing the law in such circumstances was invalid, but is there any substance to such arguments?)