Explorer map and Ominous banner names appear in item frames, draw in italics, and can be removed with an anvil

The bug

An explorer map (woodland mansion, ocean monument, or buried treasure) has its name appear in italics and displays when hovered over in an item frame. This is inconsistent with every other vanilla item in the game. See the attached screenshot.

Consider potions, which share many properties of these maps. Potions:

• All use the same ID
• Color their texture depending on their type
• Use a different translation depending on type without relying on a custom display.Name tag