I have done 2 tests.and I am not sure if these a vfls but I can see like a shiny line in both, when I move it in the reflection?? Has this happened to anyone else? Second pic in comments
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The easy at home looks like an evap (white)

Nothing in the other one
it came up within the time frame and it was a bit odd that it happened to both which are 2 different brands, so I’m a bit confused!!
it’s difficult to see in the pic but I can see it and also in the light

Better off just waiting till the morning and it will defo show up by then x