Blood sacrament (relic of the pact) channeling bug

Not sure if this would be classified as a bug, but it sure seems like unintended behavior. When channeling the blood sacrament skill from the relic of the pact unique, and you have enough reduced reservation efficiency and cost multiplier to make it only reserve one stage of life (You can get this by using essence worm unique and brutality+second wind+lifetap as support gems). Then it takes longer for the channel to auto-end when holding right-click (or whatever button blood sacrament is bound to) vs tapping right-click. This can straight up cause pain in my finger, because of having to constantly tap right-click, but it's objectively worse for my build to just hold right-click because you are in danger for a much longer time while your life is reserved. I feel like it would make way more sense if it automatically ended the channel immediately when your maximum possible reserved life is reached. I have included a link to a short video where you can see the difference when tapping vs holding right-click.

https://youtu.be/LXSEzoqb6OY