Undefining and redefining code causes overlap in instructions in the graph view

### Description

If you undefine code at 2 locations in a function and then redefine in order of their memory location, the disassembly graph view shows instructions that dont belong to the function according to the linear view.

In the above images, according to the linear view, function `main` should end at the instruction at `76e` but the graph view shows that it extends to the instruction at `77c`.

[file.zip](https://github.com/user-attachments/files/24221998/file.zip)

### Steps to reproduce the bug

- Load binary, goto the linear disassembly view of function main.
- Undefine instruction at `773`.
- Undefine instruction at `740` i.e. starting to function main.
- Reload disassembly.
- Re-define code at `740`.
- Re-define code at `773`.

### Environment

_No response_

### Additional context

_No response_