When viewing your A/B test, one or both of your variants may show a message like the one below instead of what the variant looks like.

This means that Preferr was unable to find the DOM node that corresponds with the variant rendered to one of your visitors.

Data is still being recorded for this test and the presentation to your visitor is unaffected.

To correct this problem, you may be able to add a rest prop on the component you're trying to test, and then spreading that rest prop at the root parent node in your component.

Some React components may prevent extra props from being added, and Preferr relies on these extra props to identify the DOM node that React rendered. Without these props, the styling and markup for your component won't be recorded, but the conversion data will be.