new shift shaft seal leaking

We can't know what they did or didn't do. My best guess.., They tried the short cut route. Replaced the outer seal ( maybe R&R from the outside ) not knowing that the 'O' ring seal inside is also leaking. There is a shaft in a shaft there, thus multiple seals at play. There are all the same age too. Shortly after fixing my leak at selector shaft, the front seal started leaking. No surprise there.