The YouTube channel HowNOT2 [1] has a great collection of videos testing various ropes (mostly for climbing). Among these videos, there are a couple that test specific knots (like [2]). It's overall a very fun channel, even though I don't even do any sort of climbing.
[1] https://www.youtube.com/@HowNOT2
[2] https://www.youtube.com/watch?v=dagg2-If4h8