Creating a new Metadata, updating an existing Reader changing that field, then updating another Reader still shows value from other Reader.

[Kevin Day]

I have multiple existing, configured, Readers.

I later on added a new Metadatum field.

I went back to the Readers and updated the metadatum field that was just added.
When I opened up the next metadatum field, that new field is populated with the value from the previous edit on the previous Reader.

A page refresh causes the field to properly clear.

This might be related to #480.