One of the lockdown browser advanced settings when you give a classic quiz requires students to use lockdown browser to view results. (This improves exam security it some students will have access to return to view results before other students start.) In new quizzes that is not an option, and so it may always be in effect. That would mean no matter which browser your students start in, they are always in lockdown browser to try and view the results, because it auto launches.
In classic quizzes there was a problem with combining a one-attempt quiz with a setting that allowed students to view results only once, because at the end of the quiz results would be sent once, but lockdown browser would not display them and then when students returned later to view results, canvas thought they had already been provided with those results. (The solution was to moderate and allow students to see results "one more time.") I do not believe new quizzes includes the view results only once option, and so that should not be exactly the same problem for your students. However, it sounds related.
The until date in canvas must not be communicating with new quizzes differently for quiz results verse quiz attempts. Have you submitted a support ticket about that? If not, please do, so it can be corrected.