just tried it on my home-pc ... on this computer the jumping has tanked even worse, so I'm suspecting that you have tested this game on only one computer and that the problem I was having wasn't 'bad jumping' but bad lag-handling on anything that has different specs than those oof that one specific computer.
I'm not sure about that one nether as my friend who has a terrible laptop played the game and can make the jump too.
It might be possible that your computer is just not going through the specific frame needed for the jump but I really doubt it. I think it's just a really hard jump. I struggle to make the jump myself and i've tried it hundreds of times.