Sharing some info about an issue I had on 2019 RR Sport (5L Supercharged) around 14k miles. Each time I wash the vehicle I also clean inside the rims. I started noticing recurring grease splatter on driver side rear. Crawled under and took some pics. Clearly a problem. Dealer replaced the halfshaft under warranty. Unfortunateky, barely a hundred miles later, started noticing a grinding nows (like when a wheel bearing is failing) and occsional brake chirp when backing or turning left. Back to the dealer. This time they replaced wheel bearing and brake rotors (since a gouge had already been cut into one). Not really sure if they goofed doing the first repiar or if it was a secondary problem waiting to happen. A thousdand miles later the dealer rang I wants to take it back in regarding a service bulletin in that same area of the vehicle. Not sure what the bulletin is yet, but just wanted to share this so others can keep an eye out for similar issue.

 

I am not a RR specialist, but I have seen something similar on a ML 350. It was a punctured boot ... you may want to clean that and see if and where is coming again. Although, you may be running out of grease in that boot.