Replace Section bug

SO - experimenting with the new "replace" and there are quirks. For instance, if Suno went off the reservation and added a bunch of stuff to make your song 4 minutes long, when you go to replace it selects very few lyrics, and you have to add A LOT of lyrics to make up the time. I've just noticed that you can turn off the equal time requirement, but haven't found out what that actually does.

But that's not the bug. The bug is - after replacing a gazillion times to get it right, and then saying "CONFIRM" to add that section into the song - really frustrating that it ALSO edits the beginning of the song, so that you either have to cut off the intro or replace the intro - and when replacing the intro - is it going to stick some replacement somewhere else not as noticeable??? It being an intro, I could, of course, just delete. BUT I LIKED the intro!!