Elijah Brian Kuehl

Of all updates to fix this for, the one that add bamboo blocks is a great time to do it.

Well don't I just look like a clown. Yep, that fixed it. Sorry for wasting your time. 

These effects remain consistent when using /summon to strike the mobs with lightning.

I encountered this same visual glitch, but it is not what MC-167043 describes @violine1101. I am using an unenchanted shield (though it does have a banner on it), yet the shield still has glint. The glint does indeed seem to be overflow from the chest plate's arm piece, as it does not animate smoothly, and looks like the enchantment effect is interfering with the shield's texture. Also, the effect does not entirely cover the handle, only the perimeter, and also bleeds onto some of the main part of the shield as well. I have attached images of what it looks like with and without the chest plate, along with what it looks like without the shield, in order to get a better visual understanding of the problem. I suggest this report be reopened.