Yes, it is a new issue. The team wants to fix it with the next update. A couple notes: * Some users say that reinstalling Firefox fixed this issue for them * Once the fix is released, you may still see an issue on your next immediate launch. However once you update your search engines again, the problem should no longer occur * In the meantime, users can also try deleting all their custom engines and re-adding them. This may resolve the issue for you as well without an update.