The banners that are placed onto the hostile villager towers (made of cobblestone and dark oak wood) have a different name when picked up.

What I expected to happen was...:
The banner I destroyed, then picked up from the stone/dark oak tower, should be named the same as (or similar) to the ones dropped by the NPCs

What actually happened was...:
The name was bugged, and ended up being "block.minecraft.illager_banner"

Steps to Reproduce:

1. Locate one of those cobblestone/dark oak towers that are surrounded by hostile villagers armed with crossbows.
2. Find at least one banner already placed on the structure
3. Break the banner with a stone axe (that is what I used to break it)
4. Pick up the banner
5. Hover cursor over the banner in your inventory.