C:\Temp>type repro.cpp
#include<compare>
#include<memory>

int main()
{
    std::shared_ptr<const int> p1;
    std::shared_ptr<void> p2;

    auto cmp = p1 <=> p2;
}

C:\Temp>cl /std:c++20 repro.cpp
Microsoft (R) C/C++ Optimizing Compiler Version 19.35.32215 for x64
Copyright (C) Microsoft Corporation.  All rights reserved.

repro.cpp
C:\opt\VC\include\memory(1778): error C2446: '<=>': no conversion from 'void *' to 'const int *'
C:\opt\VC\include\memory(1778): note: Conversion from 'void*' to pointer to non-'void' requires an explicit cast
repro.cpp(9): note: see reference to function template instantiation 'std::strong_ordering std::operator <=><const int,void>(const std::shared_ptr<const int> &,const std::shared_ptr<void> &) noexcept'
 being compiled

 const int *p1;
 void *p2;

 auto cmp = p1 <=> p2;