Shader code generation bug with AudioLink + Volume band

[fluffy-critter]

I'm running Poiyomi 9.0.57, and am having a problem with AudioLink tied to the Vertex Options settings. I have my material set to scale the vertices based on the Volume band, and it works fine when unlocked but as soon as I lock the shader I get a bunch of "array index out of bounds" errors. If I inspect the generated .shader source all of the errors are on lines that look like:

if (any(float4(0,0,0,0)) || any(float4(1,1,1,0)))
{
	ALScale = lerp(float4(0,0,0,0).xyz + float4(0,0,0,0).w, float4(1,1,1,0).xyz + float4(1,1,1,0).w, audioLinkBands[(4.0 /*_VertexLocalScaleALBand*/)]);
}

I notice that audioLinkBands is declared as a float4 in this context, which tells me that the Volume band would not have any way to work.