> It was a short, not a normal video mind you.

If anyone doesn't know, you can change shorts/<ID> with watch?v=<ID> in the URL and it gives you the same UI as for other videos, including the controls (the time line). Not sure why YouTube doesn't have controls for shorts. I've seen some Facebook videos not having controls, either, when I've been sent a link. I imagine it's the same for Instagram and TikTok.