Crash while linking two shaders

Description

First file TestLinkEntry.hlsl

float4 TestPos(in float4 posin);

struct VSInput 
{
    float4 Pos : POSITION0; 
};

struct VSOutput 
{   float4 Pos : SV_POSITION; 
};

[shader("vertex")]
VSOutput vs_main(VSInput input) 
{ 
    VSOutput output;
    float4 newPos =float4(input.Pos.xyz, 1.0f);
    output.Pos = TestPos(newPos); 
    return output;
};

LPCWSTR argsLink[] = { L"-auto-binding-space",L"0" };
LPCWSTR pTargetProfile = L"lib_6_x";

IDxcCompiler->Compile() and IDxcLinker->RegisterLibrary() as first dxclink lib

second file TestFunction.hlsl

struct CameraMat
{
    float4x4 projection;
    float4x4 view;
    float4x4 model;
};

cbuffer UBO
{ 
    CameraMat cameraMat;
};


float4 TestPos(in float4 posin){
    float4 Pos = mul(cameraMat.projection, mul(cameraMat.view, mul(cameraMat.model, posin))); 
    return Pos;
};

LPCWSTR argsLink[] = { L"-auto-binding-space",L"0" };
LPCWSTR pTargetProfile = L"lib_6_x";

IDxcCompiler->Compile() and IDxcLinker->RegisterLibrary() as second dxclink lib

last link two lib:

LPCWSTR libNames[] = { firstlib ,secondlib };
pLinker->Link(L"vs_main", L"vs_6_0", libNames,2, argsLink, _countof(argsLink), &pLinkResult));

then will crash

fistlib.txt
secondlib.txt

Begin by reproducing the crash with fistlib.txt and secondlib.txt, following the IDxcCompiler->Compile(), IDxcLinker->RegisterLibrary(), and pLinker->Link() calls shown in the issue. Trace the two-library link path for the vs_main entry point; done means linking these libraries no longer crashes and the result is handled normally.