Banner Glitches

When breaking a banner with silk touch (axe or pickaxe), they drop the banner along with a glitched banner. If the banner was a ground banner, it drops a banner called simply "Banner". Appears as a black banner on the inventory and dropped, and appears as a vertical wooden pressure plate when held. When placed, on walls or the ground, it places as a black ground banner. These can be broken normally, which drops a normal banner. If the banner was a wall banner, it drops an item with the same appearance, but called tile.wall_banner.name instead. When placed, it places as a wall banner, regardless of where. If placed on the ground, it is halfway into the ground. These banners always have the pattern facing south, the back half facing north. These banners cannot be broken normally, but can be exploded, or removed with pistons, water directly above the banner, or placing another banner above so it overlaps. A black, unglitched banner is always dropped (Single player only). The tile.wall_banner.name banners also stack up to 64.

From this point on, this only occurs within realms.
When broken, these drop different things. Most often they drop a normal, unglitched black banner. They can also drop black or other colored banners, which can either have the proper name, or be called "White Banner". When placed and broken again they unglitched and have the proper name. If a White banner drops from the tile.wall_banner.name banner, it does not stack with unglitched white banners.