Howdy everyone.

New here. Just got my first medium format, a Mamiya RB67 Pro-S. Got it off ebay and appears to be in good condition but I plan on taking it by a local camera store (Havel) to have them look it over. Going over it myself it looks fine but I found one thing that might be an issue, and wanted to get more experienced opinions on it.

On the back of the mirror is some rubber material. In one corner it appears to be pulling up. Would this cause a light leak?

Here's a picture of the area:

Any input is appreciated. Thanks!