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I'm not sure why the coolant didn't get into the transmission but the fluid there was nice and clear.
A good question. Can understand why the trans fluid would go into the coolant as the "converter out" pressure can be 30-50 psi which even after an orifice and pressure drop would still be a fairly decent "cooler in" pressure. Even in direct drive when the converter is along for the ride, it never drops below 10 according to the charts.
What is interesting is that when the engine was stopped and coolant pressure was higher than fluid pressure it didn't force it's way back to trans. That return route just dumps into the pan. My guess would be maybe the hole acted like a flap and inner pressure forced it open but pressure from coolant forced it back to mostly closed. Another guess would be that you might have relieved the coolant pressure before it had time.
At any rate, glad it was fairly simple, there was no damage and you found and corrected it in time.
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