[SPIR-V] Internal compiler error with bit-field

With this simple HLSL code:

struct Test {
    bool a: 1;
    int b;
};
RWStructuredBuffer<Test> buffer;

[numthreads(1, 1, 1)]
void main(){
    Test t;
    t.a = true;
    t.b = 1;
    buffer[0] = t;
}

While compiling with command dxc.exe -T cs_6_5 -spirv test_ice.hlsl, we have error Internal compiler error: access violation. Attempted to read from address 0x0000000000000030, remove -spirv by compiling to dxil is ok.