If you look at the window.png in assets/minecraft/textures/gui/advancements, you will notice a miscolored pixel at x11 y16.
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After consideration, the issue is being closed as Won't Fix.
Please note that this is not the same as Working as Intended, as this bug report correctly describes behavior in the game that might not be the intended or desirable behavior, but it will not be fixed right now. Sometimes, this is because the issue reported is minor and/or impossible to change without large architectural changes to the code base.
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I can confirm this in 1.21. The pixel at coordinates (11, 16) has the hex value #C3C3C3 instead of #C6C6C6.