Hello friends, I too have this issue and just discovered it today because I had to take my phone to a repair center to be looked at. I have been seeing black goo oozing out of my camera lenses for a couple weeks now, and finally, on Sunday I noticed there was moisture inside my camera lenses as they were all fogged up. I originally thought that moisture had got into the lenses due to this leakage of sealant around the edges, right?
So as soon as I had a chance on Monday I went to the local Apple Store to have it looked at and they were dismissive of the problem and very rude, it was quite an experience. Clearly the staff at this particular store weren’t well trained and didn’t understand how the phones are assembled nor how to inspect them. So yesterday I talked to Apple support and they were incredibly helpful and totally understood the issue and told me it’s likely a manufacturing defect and to take it in.
So flash forward to this morning, while the person was running some diagnostic tests on the phone, I’m looking down on the top of it and I notice that the rear glass in the upper left corner by the camera assembly looks raised up. The only reason I did so was because I remembered this thread, and never look at my phone from that angle in good lighting, and the Apple tech I talked to yesterday mentioned it was possible the leak was from somewhere other than the camera lenses. So I take a closer look and the right side corner is perfectly flush with the titanium frame, and the left side sticks out about a 1/64th of an inch, enough to catch my fingernail.
The good news is Apple is replacing my phone, I was really worried the last few days, I am thinking that this must be an issue they are aware of. So if you have this problem, do not ignore it as it seems to have compromised the seal on the back of the phone. I will try to get some pictures later today.