@Mike9241 I now believe that the last two examples make sense because I also have a US mutual fund with a $33 foreign tax paid. The foreign tax paid in the example plus the foreign tax paid by the US mutual fund makes the total reach the $600 limit.
That doesn't fix the bug that TurboTax silently drops the foreign tax paid when it reaches the limit instead of giving a notification that form 1116 MUST be completed.
