Creating a new element to a form with same key as an existing element causes the existing element to be overwritten

When adding a new element to a form, if the key already exists within the form, then the new element overwrites the existing element.

This occurs when key is explicitly set (like for Flexbox) or is dynamically created from title of element (like for Text area).

I would have hoped the system would add a number to the end of key to make it unique (like "_2") or at least stop the adding of the element and display a message stating the key already exists.