What you're seeing here, in my opinion, is mold.
I have grown avocado trees from pits successfully numerous times. No one's answered you and there are several things I can pass along since I'm a "master gardener" - though that doesn't apply as much here as my experience. Here's another one happily growing after changing the water and scraping off the bumps and white fungus (the brown spots on the roots are where the bumps used to be): Here's the same thing but growing around the roots: Here's how sprouts act when you let the white stuff grow above the water: It's not unlikely some variant of the ziplock bag method is easier on and safer for the seeds, requires less attention and is better overall for growing plants out of those seeds but I like keeping mine in jars with the root system exposed to observe the entire process. Normally they should be placed in soil as soon as the root is big enough (length over 1.5x the diameter of the seed). It needs to be repeated every couple of weeks if you plan on keeping them in a jar. Then I hold the seed under the tap and gently scrape off those bumps and cloudy stuff with my fingers, a cloth or wet paper towel and running water, doing my best not to break anything. What I do is I take out the pit and put it away gently (it's very easy to break the roots and sprouts) and wash the jar thoroughly before I refill it with fresh, clean water. In both cases the seed seems to fight it by abandoning affected sprouts and roots to then grow new ones from scratch or branch off the old ones.
There is another thing I figured I need to watch out for, that slows down and eventually kills the seed - white cloud of either mold or fungus, suspended around the root system and climbing the seed above water level.
If I remove it, the seed comes back to life. I do not know what that is exactly but I observed that the more of those bumps appear on the roots, the slower the seed develops. From my experience, you can and should remove those from avocado roots.
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