How are route positions handled in BottomNavigation?

Hello, has anyone had the same problem using BottomNavigation with Firebase dynamically? When I delete only the last route on the right I get this error. If I am on another route and I delete the last route on the right, nothing happens, apparently it is a problem in the array of routes but I don't understand.

Start with the BottomNavigation route handling and reproduce deleting the rightmost Firebase-driven route, both while on that route and while on another. Record the missing error details and expected behavior; the issue is ready for work once those cases can be reproduced and a clear completion condition is established.

Written by the indexing model from the issue text.