**Packages**
* `"react": "^16.13.1"`
* `"eslint-plugin-react-hooks": "^4.0.8"`

The issue #18819 still happens with `eslint-plugin-react-hooks@4.0.8`.

Using the example code from the other issue gives the following errors:

![image](https://user-images.githubusercontent.com/37122343/90794940-59d9a980-e305-11ea-9ec0-98f69b41c280.png)

![image](https://user-images.githubusercontent.com/37122343/90795019-770e7800-e305-11ea-92b8-b64407b0b22c.png)


deps.size > 1 ? 'them' : 'it'
          } or remove the dependency array.`
        );
      }
      let extraWarning = '';
      if (unnecessaryDependencies.size > 0) {
        let badRef = null;
        Array.from(unnecessaryDependencies.keys()).forEach(key => {
          if (badRef !== null) {
            return;
          }
          if (key.endsWith('.current')) {
            badRef = key;
          }
        });
        if (badRef !== null) {
          extraWarning =
            ` Mutable values like '${badRef}' aren't valid dependencies ` +
            "because mutating them doesn't re-render the component.";
        } else if (externalDependencies.size > 0) {
          const dep = Array.from(externalDependencies)[0];
          
          
          if (!scope.set.has(dep)) {
            extraWarning =
              ` Outer scope values like '${dep}' aren't valid dependencies ` +
              `because mutating them doesn't re-render the component.`;
          }
        }
      }