ember-sortable: Items cannot be reordered except dragging second item to first position

After a period of working correctly, ember-sortable is no longer functioning as expected in my project. - I can only drag the second item to the first position. - Dragging any other items (either up or down) does not reorder the list. - There are no console errors. - The issue started without any dependency changes - same software, but features are no longer working as before. **Environment** Ember: 3.24.0 Ember CLI: 3.24.0 Node: 12.x / 14.x ember-sortable: ^3.0.0 / 4.0.0 (both tested) I have attached a short video demonstrating the issue: https://github.com/user-attachments/assets/c0d60be3-6cea-4635-8ef4-d6223b39b185