It is correct, it must shine, but Mojang never said that they pretend that the player does not know what armor is
I think it was not duplicated
In the image 2019-12-05_14.27.23.png (1.14.4) the brightness is hardly noticeable. If MC-163909 is WAI, it should look like 2019-12-05_14.28.59.png (but with light level = 0).
MC-163909 talks about enchanted items glowing in the dark (WAI), but MC-167119 talks about the enchantment glint is not dimmed properly, since it makes it impossible to know what kind of armor it is.
I did it
1.14.4
https://www.youtube.com/watch?v=ard0nGTD9Ck
1.15.2
https://www.youtube.com/watch?v=aPEeQqwj71M
20w09a
https://www.youtube.com/watch?v=dxtu8sLIcqg