Mouse enter an mouse leave events not working when opening a project on 4.2.1 from 4.1.2

### Tested versions

Reproducible in:
Godot_v4.2.1-stable_win64
Godot_v4.1.2-stable_win64

### System information

Windows 10 , 4.2.1-stable

### Issue description

I have made a testing project for some grid puzzles, i am using the mouse_entered and mouse_exited signal to see if the mouse is under a piece. When working on Godot 4.1.2, everything works as intended but if i open the project with Godot 4.2.1 the mouse signals are not fired anymore.

### Steps to reproduce

This is the link to the project if you want to try it out. https://github.com/irafunesta/grid-puzzle.git

### Minimal reproduction project (MRP)

https://github.com/irafunesta/grid-puzzle.git

Start by opening the linked grid-puzzle minimal reproduction project and testing it with Godot 4.1.2-stable and 4.2.1-stable on Windows 10. Compare whether the mouse_entered and mouse_exited signals fire over the puzzle pieces; the issue is done when the behavior is consistent with the 4.1.2 result.

Written by the indexing model from the issue text.