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Bad valve seal? Oil entering combustion chamber

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Location
Buffalo, NY
Vehicle
2020 Magnetic Gray ST w/ Street Pack
#1
I dont expect to get much from this post considering the lack of information Ive found on this particular issue, but figured id ask anyways. I have an issue of cylinder 5 puddling oil on top of the cylinder on cold start after a drive cycle. I found this while changing the spark plugs trying to search for the issue and using a boroscope. I took it to the dealer and they confirmed the issue, allegedly found oil in the spark plug well (which i did not find when I originally found the issue) and decided to do a valve cover gasket. After picking it up it continued to have the same issue, no change at all. So either the job was botched, which i find to be unlikely, or it has a bad valve seal. Has anyone experienced any issues like this before?

Link to video of cold start approximately 2 hours after drive cycle https://youtube.com/shorts/rMx0sf5fH_k?si=ljvyER1zVLdI9rq1
 

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