That’s still not unusually “tricky”, and it still isn’t any more difficult to code “Especially bugfree on the first pass” than most other changes. Any change can be difficult to code “bugfree on the first pass”, that doesn’t qualify this change as extra “tricky”.
There is room to discuss possible solutions, but it still remains true that you’re trying to make this sound falsely complicated. Your previous statement, “Not impossible, just tricky. Especially bugfree on the first pass.” is not true.
Yes, of course you want to test it, because obviously, just like testing any change in the game. It’s pretty silly for you to state the obvious and then pretend that it’s an insightful observation. Stating the obvious as though it’s somehow meaningful or insightful is just blowing air over nothing.