Ok, so the steps are a bit more specific. You need to hit up to go towards the dresser, but mashing space at the same time as hitting up makes the arm folding animation play and skips the scarab drawer.
This is not accurate, at least for the GOG edition. Laura either does the animation of opening the drawer or folding her arms when you approach the dresser. Pressing space when you are still one step away from the dresser does not make her approach and open it, and holding space while walking towards it does not prevent the scarab animation from happening either. I think that this might be one of the only (if not the only) RNG moments in the game. I may end up switching to attempting the all scarabs category only because this happens the majority of the time for me too
I just played this on my saturn and thought about speedrunning that version too. I use a fenrir ODE though and swapping discs is a little slower than the conventional method. This question would go for the playstation version too
Current 1st place in the category that loads on the first leaderboards page is set to private https://www.speedrun.com/garou_mark_of_the_wolves/runs/mk8eo93m