Failed to specialize function template

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Hi,

I have been trying to use this library within a simple visual studio project.
This works without issues:

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

int main () {
    if (auto result = scn::scan<int, double>("12, 3.1415", "{} {}"); result) {
        const auto& [first, second] = result->values();
        std::cout << first << " " << second << "\n";
    }
}

However, if I add the required code for a custom type.

struct Test {
    int i;
};

template<>
struct scn::scanner<Test> : scn::scanner<int> {
    template<typename Context>
    auto scan(Test& test, Context& ctx) -> scn::scan_expected<typename Context::Iterator> {
        return scn::scanner<int>{}.scan(test.i, ctx);
    }
};

int main() {
    auto result = scn::scan<Test>("12", "{}");
    std::cout << result->value() << "\n";
}

I get the following compiler error C2672 'scn::v3::scanner<Test,char,void>::scan': no matching overloaded function found.

1><path>\scnlib\include\scn\scan.h(4942,9): error C2672: 'scn::v3::scanner<Test,char,void>::scan': no matching overloaded function found
1>could be 'scn::v3::scan_expected<Context::Iterator> scn::v3::scanner<Test,char,void>::scan(Test &,Context &)'
1>	<path>\scnlib\include\scn\scan.h(4942,9):
1>	Failed to specialize function template 'scn::v3::scan_expected<Context::Iterator> scn::v3::scanner<Test,char,void>::scan(Test &,Context &)'
1>		<path>\scnlib\include\scn\scan.h(4942,9):
1>		With the following template arguments:
1>			<path>\scnlib\include\scn\scan.h(4942,9):
1>			'Context=context_type'

I'm using the latest 3.0.1 together with visual studio 2022 17.8.
What am I missing here?

Thanks in advance