How Lend-Lease worked around treaty constraints

How could the United States send munitions through Lend-Lease despite treaty restrictions?

The treaty system is described as having collapsed by then, leaving the United States able to proceed and defend its decision through its lawyers.

The treaty rule described here would require a country to disclose the weapons supplied to another state. By the Lend-Lease period, the treaty system is judged to have collapsed. The United States proceeded with the transfers and relied on its lawyers to defend the decision. The disclosure rule is treated as ineffective in those circumstances, without a specific legal change being identified.