The only answer as of Aug2 2021 discusses if the Youtube bell has an effect or not. I feel this doesn't help the OP concretely.
I recognise that they effect the score own comments. What's happening is the internal number changes but the user who down votes can't see the effect. I have observed this with my own YouTube account when my posts get a few up votes and then zero displayed. Turn on comment notifications and you can see the effect. The comments are broken in a lot of ways