Resource pack fails to load when the itemframe blockstate is multipart

Gives that a hint ?

[23:27:33] [Client thread/INFO]: Caught error stitching, removing all assigned resourcepacks
boi$b
	at boi.c(SourceFile:74) ~[1.9.2.jar:?]
	at bxo.a(SourceFile:243) ~[1.9.2.jar:?]
	at bxo.c(SourceFile:234) ~[1.9.2.jar:?]
	at bxo.a(SourceFile:168) ~[1.9.2.jar:?]
	at bxp.a(SourceFile:23) ~[1.9.2.jar:?]
	at bwi.c(SourceFile:105) ~[1.9.2.jar:?]
	at bwi.a(SourceFile:93) ~[1.9.2.jar:?]
	at bcc.f(SourceFile:720) [1.9.2.jar:?]
	at bgv.a(SourceFile:133) [1.9.2.jar:?]
	at bey.a(SourceFile:341) [1.9.2.jar:?]
	at bgv.a(SourceFile:141) [1.9.2.jar:?]
	at bey.k(SourceFile:404) [1.9.2.jar:?]
	at bgv.k(SourceFile:77) [1.9.2.jar:?]
	at bey.p(SourceFile:381) [1.9.2.jar:?]
	at bcc.t(SourceFile:1575) [1.9.2.jar:?]
	at bcc.av(SourceFile:962) [1.9.2.jar:?]
	at bcc.a(SourceFile:392) [1.9.2.jar:?]
	at net.minecraft.client.main.Main.main(SourceFile:124) [1.9.2.jar:?]
[23:27:33] [Client thread/INFO]: Reloading ResourceManager: Default
[23:27:33] [Sound Library Loader/INFO]: Sound engine started

There shouldn't be an error, the resource pack is generated using a lua script. They are all the same files pointing towards the same model.
It works when the model is only applied to one block, but it fails whenever all blocks and items are applied.