SkeletonModification2DCCDIK causes errors when a second instance of itself it instantiated

### Tested versions

Godot version
v4.3.stable.official [77dcf97d8]

System information
Windows 10, ryzen 5, radeon 3080

### System information

v4.3.stable.official [77dcf97d8], Windows 10, ryzen 5, radeon 3080

### Issue description

When using SkeletonModification2DCCDIK within SkeletonModificationStack2D editor displays huge amount of error messages (before execution).
However this happens only when SkeletonModification2DCCDIK is present (not deleted) **AND** a second instance of the character is loaded.
A single instance of the character works perfectly fine.


### Steps to reproduce

-Create Skeleton2D (based on Poylgon2D)
-Assign SkeletonModificationStack2D and SkeletonModification2DCCDIK
-Load Character scene into a new project
-Duplicate character scene


### Minimal reproduction project (MRP)

[minimal test.zip](https://github.com/user-attachments/files/17193664/minimal.test.zip)

Start by opening the attached minimal test.zip in Godot v4.3 and follow the listed Skeleton2D, SkeletonModificationStack2D, and SkeletonModification2DCCDIK reproduction steps. Compare one character instance with two duplicated instances; the issue is done when the second instance no longer produces the reported flood of editor errors.

Written by the indexing model from the issue text.