Very minor bug in the new Content Examples project, Reflections map. 1.1 Roughness, first sphere has material with roughness 0, but the text says Roughness=1.
Thank you for your report. I have looked into the typo and can confirm that it has been fixed on an internal build, but it was not caught in time to make it into the Beta 5 release candidate. This will be resolved in a future release of the map.