 The problematic (salient) reading is the one is which everybody else put their own paychecks in the bank. The first sentence only introduces John’s paycheck, hence “it” doesn’t have a proper antecedent. Standard dynamic accounts don’t have the machinery for dealing with pronouns without the proper linguistic antecedent, since it is the antecedent’s effect on the context that accounts for the anaphoric pronoun’s  interpretation (but see Keshet (2018) for a recent dynamic semantics of anaphora that includes an account of paycheck pronouns).[22]