Indeed - you should check that pin 9 still works as input and output in case it has been damaged. Hopefully it survived.
It would be great if that could be combined with a 'debug' LED shield that shows the state of all pins (one LED per pin). The voltage divider for testing purposes would have to be below the LED threshold to prevent it turning on LEDs. In fact if the LEDs are arranged to come on weakly if tri-state, you could probably visually check the pin functions directly as well as use it as a debugging tool.
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