Simple scan of multiple values fails after one string value

[RazielXYZ]

scnlib 4.0.1
Take for example this simple test code:

#include <iostream>
#include <string>
#include <scn/scan.h>

int main()
{
    auto scanResult = scn::scan<std::string, std::string>(
        "TEST.32.bar", "TEST.{}.{}");

    if (!scanResult) {
        std::cout << scanResult.error().code() << " " << scanResult.error().msg() << "\n";
    }
}

This fails with code 3, Unexpected end of source.
Changing the first argument to int makes it succeed, however adding any more arguments after the std::string goes back to failing. I've also seen it fail with "Argument list not exhausted" in some cases.
Is reading more than one string out of an input, or anything else after reading a string, given well-defined separators, not supported in this manner?