Zero initializing array of struct causes error: cast<X>() argument of incompatible type!

[sudonatalie]

Description
Compiling the following HLSL causes an internal compiler error:

repro.hlsl:

struct s {
  float f;
  float2x4 m;
};

struct t {
  s a[1];
};


static t g = (t)0;
[numthreads(1, 1, 1)]
void main() {
  s h = g.a[0u];
}

Steps to Reproduce
dxc -T cs_6_6 repro.hlsl

Actual Behavior
error: cast<X>() argument of incompatible type!

Environment

• DXC version: libdxcompiler.dylib: 1.10(dev;5155-60a1c856); libdxil.dylib: 1.10
• Host Operating System: macOS