UPDATE: Now the picture works so idk why before it doesn't work and the other yes. I hope this bug doesn't appear again.

I've modified every new paintings but the "humble" painting doesn't modified... so I think is a bug becouse with other painting it works...

example:
if I put the image called "baroque.png" in this file path: C:\Users\user\AppData\Local\Packages\Microsoft.MinecraftUWP_8wekyb3d8bbwe\LocalState\games\com.mojang\minecraftWorlds\world\resource_packs\nametexture\textures\painting the image works.
But if I named the image "humble.png", it dosn't works.

Under I have attached the image I used: