TextField with placeholder text strange behavior with Binding

When a non-child Binding targets a TextField with placeholder text, deleting the placeholder text then tabbing to another element results in strange text behavior.

If the Binding is a child of the TextField instead the behavior does not occur.

See the attached project.

To reproduce the error, delete the placeholder text in the first TextField then tab to move to the next element, the "Placeholder" text on top will expand downwards behind the placeholder text.