This issue has been resolved in Vuforia Studio 8.5.14.
There is a known issue with newly created 3D eyewear projects using the Scan widget. Using the Scan widget in a 3D eyewear experience will cause Preview for existing projects and newly published Experiences to crash. This does not affect existing published 3D eyewear projects, only 3D eyewear projects that are previewed or published in Vuforia Studio 8.5.13. We are actively working on a fix for this issue and will update this post when one is available.
