GraphEdit frame bug makes all moving objects become children of one frame

### Tested versions

Godot 4.3 Stable

### System information

Windows 10 x64, Godot 4.3

### Issue description

When several nodes are selected from different frames, Godot picks one of these frames and adds everything into it (even when other items never collided with this specific frame).

https://github.com/user-attachments/assets/62f34d92-7057-4db1-9881-a60dd858090c

### Steps to reproduce

1. Make several frames and fill them with nodes
2. Select nodes from multiple frames
3. Move them around

### Minimal reproduction project (MRP)

Be my guest: https://github.com/ArseniyMirniy/Godot-4-Color-Correction-and-Screen-Effects

Start with the linked minimal reproduction project and reproduce the issue in Godot 4.3 using the listed steps: create frames, fill them with nodes, select nodes across frames, and move them. Done means moving the selection no longer makes all selected objects children of one frame when they came from different frames.

Written by the indexing model from the issue text.