catch_amalgamated.cpp(8072,33): error C2593: 'operator <<' is ambiguous

Describe the bug I am using the latest 3.7.1 version of catch_amalgamated.hpp and catch_amalgamated.cpp and I have a simple example file, tests.cpp:

#include "catch_amalgamated.hpp"

unsigned int Factorial(unsigned int number) {
    return number <= 1 ? number : Factorial(number - 1) * number;
}
TEST_CASE("Factorials are computed", "[test]") {
    REQUIRE(Factorial(1) == 1);
    REQUIRE(Factorial(2) == 2);
    REQUIRE(Factorial(3) == 6);
    REQUIRE(Factorial(10) == 3628800);
}

When I try to compile it (in Visual Studio 2019, C++17), I get many of these compilation errors:

catch_amalgamated.cpp(8072,33): error C2593: 'operator <<' is ambiguous
catch_amalgamated.cpp(6598,10): message : could be 'std::ostream &Catch::operator <<(std::ostream &,Catch::StringRef)'
catch_amalgamated.hpp(773,30): message : or       'std::ostream &Catch::operator <<(std::ostream &,Catch::StringRef)' [found using argument-dependent lookup]
catch_amalgamated.cpp(8072,33): message : while trying to match the argument list '(std::basic_ostream<char,std::char_traits<char>>, Catch::StringRef)'
catch_amalgamated.cpp(8106,33): error C2593: 'operator <<' is ambiguous

Any idea why?

Expected behavior The code should compile.

Reproduction steps

Copy catch_amalgamated.hpp and catch_amalgamated.cpp to the solution folder
In the Visual Studio add both files to the project.
Build project -> error

Platform information:

OS: Windows 10
Compiler+version: Visual Studio 2019
Catch version: v3.7.1

catchorg / Catch2

catch_amalgamated.cpp(8072,33): error C2593: 'operator <<' is ambiguous #2916