OnTextChanged not called for UEditableTextBox / UMultiLineEditableTextBox when text is set programmatically

When calling SetText() on a UEditableTextBox or UMultiLineEditableTextBox, the OnTextChanged delegate is not triggered.
This regression was first reported in UE 5.3 and acknowledged previously in UDN here: [Link Removed].
A fix was mentioned for 5.4, but as of UE 5.6 and the latest Main (CL 45937871) the issue persists.

• Setting text via UI input triggers OnTextChanged correctly.
• Setting text via code/programmatic update does not trigger OnTextChanged.
• This affects both UEditableTextBox and UMultiLineEditableTextBox.

1. Open the attached repro project.
2. Press Play in PIE.
3. Wait a few seconds: the EditableTextBox will be updated by the Level Blueprint calling SetText.

Expected: OnTextChanged delegate fires and triggers a Print String.
Actual: No event fires. However if you type directly into the EditableTextBox via the UI, the OnTextChanged delegate fires correctly and the Print String is called.