So even if you put a mask on and try to unlock it one-handed with your thumb, zero delays or hiccups at all?
If so then it sounds like you've got one that barely has it (the flash light / camera) and that's great. Personally I've been able to recreate the issue at varying levels on about 15 different devices now between myself, a handful of people I know that got it, and a handful of different retailers where I was there anyway and decided to test. Different sources, different locations. So unless our region has a bad batch, combine that with what we're seeing reported online, and it seems pretty widespread.