Netherite helmet doesn't have enchanted glint on armor stands.
1. Place an armor stand
2. Place enchanted netherite helmet onto the armor stand
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I cannot reproduce.
[media]

Please force a crash by pressing F3 + C
for 10 seconds while in-game and attach the crash report (minecraft/crash-reports/crash-<DATE>-client.txt) here.

I was able to reproduce. It seems to depend on the angle you are looking at it.

This also once happened to me, I just don’t know how to reproduce. This probably affects all types of helmets. In Peppzzii’s video https://youtu.be/RybcgRslzGE?t=105 you can see this happening with a diamond helmet.

May be related to MC-168139
I am still able to confirm this in 20w51a. I've attached a screenshot.
Can confirm in 21w03a.
Can confirm in 21w06a.
Can confirm in 21w07a.
Can confirm in 21w08b. I've attached an additional video.
I am unable to reproduce this issue in 1.17.1

Resolving as 'Cannot Reproduce' for now. A fix version can be added afterwards in case someone finds out the exact version where this got fixed.