Using F5 mode, putting the camera inside of a banner will make a enchantment glint overlay on the inside of the banner.
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Hey Nick!
I tried the glitch that you had and I had different effects, I used all types of banners even the Ominous Banner with invisiblity and elytras but I still couldn't get the same effects.
By chance did you use a version other than 1.15.2?

Hm, thats intresting. The world in the screenshots have always been on 1.15.2. Have you tried banners from other raid members, or from pillager captains themselves?
Merged into MC-167532.