First of all, 62% is a great result. It’s in the average mark range for a dissertation (60-69) and 62% is still a 2.1 score (1sts tend to be 100-70, 2.1s 60-69, 2.2 50-59, and the rare 3rds are like 45-49). As long as the rest of your grades are in the 2.1 boundary you should be fine as they would look at overall degree grade award anyway.
I don’t know how it would work for scholarships though. I basically just eked my 1st (with 72% on my dissertation) so I got a partial scholarship based on that - I didn’t apply or anything they just awarded it. So if you’re worried about that I’d maybe start applying for other scholarships you qualify for.
With the dissertation specifically, my supervisor called my dissertation one of the best written ones he’s seen - probably just being really nice tbh - but gave me 72%. I know 2 people who did brilliantly and got 80-90% but they were really rare on my course and I think they did joint degrees.
There’s also a difference between qualitative vs quantitative dissertations - and I think quantitative ones tended to be graded higher as you could build in testing of results and controls. So it could just be the methodology being to simple or something. Or your supervisor and the 2nd one is just a harsh marker. You’ll probably get like a breakdown of where you went wrong.
You might be able to appeal it if you are very unhappy but that’s dependent on your unis system.