Ace Core: Code folding on a split line does not work correctly.

### Describe the bug

Version: 1.43.5

Ace Core: Code folding on a split line does not work correctly.

### Expected Behavior

When a code is folded, it can be unfolded using the same button if the node is split to occupy more than one line in the editor.

### Current Behavior

When a code is folded, it cannot be unfolded using the same button if the node is split to occupy more than one line in the editor.

### Reproduction Steps

Use the editor to check the XSLT code:

//on new line

CableBuilder: Project: Styles

Click the arrow to fold the code.
The code will fold. When you want to unfold:

### Possible Solution

_No response_

### Additional Information/Context

_No response_

### Ace Version / Browser / OS / Keyboard layout

1.43.5/Chrome/Windows/UK standard