NaN values in SNAP toolbox

See under the band’s properties if NaNs are enabled and how they are stored. Sometimes 0 is considered NaN.
It can also be defined in the first window of the band maths already.

maybe the NaN you see in the pixel info are created by an valid-expression or by applying a no-data value.
You can check your band if these properties are set. Easiest to see in Information Window.
What type of product are you using?

I just had to untick "no-data value used" option under band properties. Thanks, @marpet & @ABraun.

regards

@marpet please check this issue too, it’s bothering some users: