Not possible to create Replicated cache

Go to "Create a Cache" > Write the name and choose "Build cache configuration" > by default "Distributed" is selected. Choose "Replicated" ( the "Set the number of owners" field will disappear). Then without changing other fields going further with "Next" button.

On the last "Review configuration" page when clicking "Create" button, error message is shown (see the screenshot). The removal of the "owners" field from the JSON doesn't have any affect still the error is shown.

The JSON area is editable but any changes made there aren't taken into account while cache creation. Maybe then it worth to make read-only for not confusing the users. WDYT?