When using Ctrl + Middle-click on Ominous Banner, instead of giving you the Ominous Banner, it gives you a nameless White Banner with (+NBT) data.
When using Middle-click on Ominous Banners it gives you a normal Ominous banner, but Middle-click + Ctrl gives you a broken ominous banner. (See screenshot)
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Can confirm. Also affects 20w51a.

Can confirm in 1.17.1.

Relates to MC-151793?

This was fixed in 24w09a.