When looking at an armour stand that has an enchanted item in its hand, the enchant glint of that item can disappear when looking at it from a certain angle.
To reproduce
Create a void world
Build a platform
/summon minecraft:armor_stand ~ ~ ~ {ShowArms: 1b, HandItems: [{id: "minecraft:diamond_sword", Count: 1b, tag: {Damage: 0, Enchantments: [{lvl: 1s, id: "minecraft:unbreaking"}]}}, {}]}
Look at the armor stand from certain angles
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I have a GTX 1050ti Graphics card, 8gb RAM, Intel corei5 9600KF (3.7GHz) processor and Java 8
Okay, thank you. I checked again (I have the same graphics card) and it happens to me too, but only in a void world. Might be related to what entities render in the background or similar.

Can this still be reproduced in 1.16-pre8 or later?
No i could not reproduce this bug in 1.16-rc1 with fabulous graphics on so i think it has been fixed.
Cannot reproduce anymore either. If the issue reappears, please file a new ticket.
Cannot reproduce. What are your system specs?