Depends on what "preview” means. If it means an alpha build meant to be internal, such a bug is fine. To me this build was meant to be shown and tested by customers and closer to a beta build. Nothing ruins testing like the inability to test anything.
One time my company was asked to test some software for a supplier. The software would not run after install on any of our computers. There were no errors displayed to give us hints about what could be wrong. Despite weeks of correspondence with their development team, we could never get the software to run. After the testing period was over, they sent us a questionnaire. Unfortunately we could not answer most of the questions as we could never get it to run. One final question was about the readiness of the software for production. We said the software was not ready for production.
The development team was not happy about that and emailed asking for reasons why we said that. I assume their supervisors read the questionnaire responses. We told them that any software that would not work after weeks of correspondence and no hint about what to fix was not production ready. They responded they had since fixed all installation issues in the latest version. We answered back that we could only test the version we were given and that version did not work.