The idea is simple. The conservation law is not.
What I suspect is that the conservation law and its approximations are smart. Which means they are solved in a smart distributed way.
So what does this mean for the electron. What if the electrons are not moving aimlessly. I guess that electrons and ions are complex networks in themselves.
So if the same electron goes home to its atom ”birth” place. This makes it easier for the universe network calculation to be a little more sure that no mass has been lost. Distributed calculations is a faster way.