replaceitem acacia log bug

Aparently When I Was Working On FNAF3 MC Map, Since I Was Running Out Of Blocks To Model/Texture, I Decided To Retexture BB's Face To Make It Look Like It Was Crying, Like In Chica's Party Minigame.
I Encountered A Minecraft Bug When I Did The Following Command:
/replaecitem entity @e[name=Cry2] slot.armor.head minecraft:log 1 4
The 4th Selector Says Its Acacia Log, But The Texture Is Completely Missing. It Shows A 2x2 Pixel Image With light_purple And black.
So I Turned The Texture Pack Off, And Still The Acacia Log Has A Missing Texture. So This Is Why I Reported It Here. I Also Tried It On For Myself WIth The Following Command: /replaceitem entity @a slot.armor.head minecraft:log 1 4
And Still It Was A Missing Texture With It Saying That It Was An Acacia Log.
I Hope You Guys Fix This Soon!