'Standard practice' is to run _different_ colors of 'hot' wire. With all the wiring on a given phase being the same color. I use different colors for each hot phase, _and_ unique colors for any 'switched' hot leads. If I have 3 switched leads in the same place, they'll be three different colors -- e.g. 'yellow', 'pink', 'blue'. With this kind of set-up, if you find a 'non-red/black' - neutral pair, you *know* you can't _trust_ that the *circuit* is dead, just because there's no power across the pair. Gotta find the switch (or switches!!) first. and check _there_.
Any competent electrician, does any breaker 're-arranging' only _within_ a single color. Or *thoroughly* investigates the details, and then 'marks'
*both*ends* of any wires that get 'moved' to a different phase. *AFTER* having made sure that neutral load currents are _not_ exceeded.This is practically 'no-brainer' stuff for a professional. The amateur that doesn't understand stuff at this level, should *not* be messing in the panel.
This is also why =many= communities have a 'basic wiring' test that you have to pass, _as_a_homeowner_, before you can get a permit for 'do it yourself' work. These exams are _not_ difficult -- their primary purpose is to ensure that you know enough to not to anything 'dangerously stupid' in _residential_ wiring.