I replaced the transmission pan gasket and filter 6 months ago and there was no leak.
The car is still running fine and there is no leak at all.
The trick is not to tighten the bolts too much. Here is what I did
last time. I tightened the bolts not too tight initially and tested drive the car to check the leak.
I kept tightening the bolts until there was no leak.
Hope this help.