Copy+Paste with custom widget seems to "break link" with default values

It should be noted that this issue does not occur if you were to create a new "test widget" (by dragging it from the widget list) every time instead of copying and pasting an existing widget.

The issue occurs in both 4.20.3 (CL 4369336) and 4.21.0 (CL 4541578).

1. Download and open attached project
2. Open both widget blueprints
3. Delete existing "test widget" in canvas panel for "bugged widget"
4. Add new "test widget" to canvas panel
5. Copy added widget and paste under canvas panel (can be repeated several times if desired)
6. In "test widget" Blueprint, change text value and recompile

Result: Only one of the "test widgets" in the "bugged widget" will have its text updated.

Expected result: All widgets will have their text updated.