Well, I was just trying banners.
I tried to take a cyan banner with the mouse wheel in creative mode and strangely I got a black banner.
What I expected to happen was
Getting the banner that I chose.
What happend instead
It gave me a black banner.
MC-63563
Trying to get a banner of any color with the mouse wheel will give you in every case black banner.
Resolved
Duplicate
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You need to use ctrl+pick block to get the banner with the colour.