Sprite2d Inspector Animation frame flickering

### Tested versions

- Reproduceable in 4.2.1

### System information

Windows 10 - Godot 4.2.1

### Issue description

Using 4.2.1 Godot and downloaded tutorial https://github.com/ChrisTutorials/SidescrollerQuickstart-StateMachine-AnimationTree

Tried following the tutorial and it did the same thing. Initially I thought it was cause it's a different version but even following it had the same issue despite being able to have everything the same on latest version.

Sprite2d > Inspector > Animation frame fields flickering

### Steps to reproduce

Download github tutorial and view Sprite2d > Inspector > Animation frame fields flickering

https://jmp.sh/s/ZqwlgPKZrgvSk3GAMRLU

### Minimal reproduction project (MRP)

https://github.com/ChrisTutorials/SidescrollerQuickstart-StateMachine-AnimationTree

Open the linked Minimal reproduction project and reproduce the flickering in the Sprite2D Inspector's Animation frame fields on Godot 4.2.1. Start by comparing the tutorial project setup with the reported steps; done means identifying and correcting the Inspector flicker and confirming the fields remain stable.

Written by the indexing model from the issue text.