heap corruption when using multithreaded std::cout in TEST_CASE

[ZFail]

Heap corruption occurs when using std::cout from multiple threads in TEST_CASE

Reproduction steps

#include <iostream>
#include <thread>

TEST_CASE("cout test") {
    auto thread1 = std::thread([] {
      for (size_t i = 0; i < 100; ++i) {
          std::cout << "thread 1 iteration " << i << std::endl;
      }
    });
    auto thread2 = std::thread([] {
      for (size_t i = 0; i < 100; ++i) {
          std::cout << "thread 2 iteration " << i << std::endl;
      }
    });
    thread1.join();
    thread2.join();
}

running under Debug causes Assertion:

Debug Assertion Failed!
Program: ...make-build-debug-visual-studio-2022\examples\010-TestCase.exe
File: minkernel\crts\ucrt\src\appcrt\heap\debug_heap.cpp
Line: 904
Expression: _CrtIsValidHeapPointer(block)

and call stack:

RtlRegisterSecureMemoryCacheCallback 0x00007ffbee50a313
memset 0x00007ffbee4ccd24
RtlValidateHeap 0x00007ffbee46e115
HeapValidate 0x00007ffbec20ebcb
_CrtIsValidHeapPointer 0x00007ffb77162fd1
_calloc_base 0x00007ffb77161385
_free_dbg 0x00007ffb771649c5
operator delete(void *) 0x00007ff6ad894258
operator delete(void *,unsigned long long) 0x00007ff6ad892ff8
std::_Deallocate<16,0>(void *,unsigned long long) xmemory:255
std::allocator<char>::deallocate(char *const,const unsigned long long) xmemory:827
std::basic_stringbuf<char,std::char_traits<char>,std::allocator<char> >::overflow(int) sstream:278
std::basic_streambuf<char,std::char_traits<char> >::xsputn(char const *,__int64) 0x00007ffb77a94159
std::basic_streambuf<char,std::char_traits<char> >::sputn(char const *,__int64) 0x00007ffb77b073e8
std::operator<<<std::char_traits<char> >(std::basic_ostream<char,std::char_traits<char> > &,const char *) ostream:780
<lambda_d56caa88a1f7eee8a1f37addf49df3db>::operator()() 010-TestCase.cpp:15
std::invoke<<lambda_d56caa88a1f7eee8a1f37addf49df3db> >(<lambda_d56caa88a1f7eee8a1f37addf49df3db> &&) type_traits:1480
std::thread::_Invoke<std::tuple<<lambda_d56caa88a1f7eee8a1f37addf49df3db> >,0>(void *) thread:55
_register_onexit_function 0x00007ffb77184c7c
BaseThreadInitThunk 0x00007ffbecb47034
RtlUserThreadStart 0x00007ffbee462651

Platform information:

• OS: Windows 10 Pro 20H2
• Compiler+version: Visual Studio 2022
• Catch version: v3.0.1