When you have a stack of 2 or more banners, and you shift-click them on to a enchantment table it clears one of the banners.
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No, i Shift-clicked the colored banner you see there and in-turn it turned it white in the enchantment table, this bug can be reproduced, try it yourself
Your screen shots contradict the problem you mentioned. there is a banner in the enchantment table slot and one in your inventory.
Why waste peoples time with something like this?
Invalid?