Archived moments half XP

I find it unfair that past moments only give you half XP. I’m currently trying to get gold on all moments, and very often when I improve the previous medal, I get 0 XP as reward, which is very annoying. This is because if I got say Silver=250 XP when moments was not archived, if I get gold now that is archived I get 400/2= 200 XP, so I earn nothing, lucky I don’t have to return 50 XP… This doesn’t promote to improve one’s own medals, quite the opposite.