Cut & Paste in Sequencer breaks with Attach track

Cutting two tracks in sequencer, which one is attached to another one, and pasting it break with Attach track. By this operation, Attack track loses its binding object. Copying such tracks and paste it into another sequencer shows the same issue.

This could be a regression bug. It was fixed by UE5.1, but it happens again in UE5.5.

1. Create a new project.
2. Placing two Cubes, "Cube 1" and "Cube 2", on a level.
3. Add a level sequencer from the tool bar.
4. Add Cube 1 and Cube 2 to the level sequencer.
5. Convert these two object bindings to Spawnable.
6. Add Attach track to Cube 1 and parent it to Cube2.
7. Select all tracks and Cut (Ctrl+X)
8. Paste it (Ctrl+V)

Expected Result:
Cube 1 Attach track still refers to Cube 2. In Outliner, Cube 1 is under Cube 2.

Actual Result:
The Cube 1 Attach track still exists but does not show referencing object name on it. The Constraint Binding ID of the Attach track is now Unresolved. In Outline, Cube 1 and 2 are in the same depth level, not parent-child relationship.