Shared Read-only items inconsistencies

When sharing something as read-only to other users, options in the "..." menu on the left of items are currently presenting menu items for Mirror, Link, and Delete.

Shouldn't these be inactive/invisible since the items are readonly?

Selecting Duplicate or Delete causes a yellow banner to appear at the top of the browser saying "We're sorry, the server encountered an error while saving your data....", but this is vague. With the options that are non-functional for read-only removed, this banner would not be necessary, although it might be handy to see a permanent banner at the top of Read only views that says specifically "Read Only Shared List" or something similiar.