Add multiple fields does not display any fields with "using" directives.

[jcallaghan-sysco]

Description

Add multiple fields code action does not display any fields after adding a "using" directive different to the current namespace.

Reproduce

To reproduce, create a page with a "using" namespace different to its own. Add multiple fields shows no fields.

Removing the using statement shows the fields.

Adding a using statement for the current namespace shows the fields.

Expected Behaviour

To not use the current namespace as a redundant using.