Question Several Broken Texture in IOS LWRP

i am building a mobile game for android & IOS using LWRP (for shader graph in 2018.4)
the android build work and render perfectly fine.
but when i build it on IOS i got several missing textures / material either resulting in black / white texture

i've tried adding opengles into graphic api, removed metal, vice versa. it just resulting in different broken texture (black / white).
is there any other solution for this ?

thank you beforehand

 

I'll send this post over to see if we can get some assistance for you @as3mbus

 

Update : it somewhat fixed by 3d artist. it was model problem.
but we still don't know what actually broke the model.
the fix is molding / re make the model using model that render properly.

my only assumption is probably ios model rendering standard are much more strict. this results different rendering mechanism.

a resource that make me come up with the assumption here