SpringBoot Custom binding converters are ignored when working with collection types

The code below works correctly in 2.7.18, 3.0.13 and 3.1.6, but when used with 3.2.0, it fails with exception.

Failed to bind properties under 'config.list' to java.util.List<foo.bar.Application$CustomType>:

    Property: config.list
    Value: "key2-value2,key3-value3"
    Origin: class path resource [application.properties] - 2:13
    Reason: org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [java.util.List<foo.bar.Application$CustomType>]

Application.java

package foo.bar;

import java.util.List;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.EnableAutoConfiguration;
import org.springframework.boot.context.properties.ConfigurationProperties;
import org.springframework.boot.context.properties.ConfigurationPropertiesBinding;
import org.springframework.boot.context.properties.EnableConfigurationProperties;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.convert.converter.Converter;
import org.springframework.stereotype.Component;

import foo.bar.Application.Config;

@Configuration
@EnableAutoConfiguration
@ComponentScan
@EnableConfigurationProperties(Config.class)
public class Application {

    public static void main(String[] args) throws Exception {
        ApplicationContext ctx = SpringApplication.run(Application.class, args);
        Config c = ctx.getBean(Config.class);
        System.out.println(c.scalar().key() + " - " + c.scalar().value());
        for (CustomType ct : c.list()) {
            System.out.println(ct.key() + " - " + ct.value());
        }
    }

    @ConfigurationProperties(prefix = "config")
    public static record Config(CustomType scalar, List<CustomType> list) {
    }

    public static record CustomType(String key, String value) {
    }

    @Component
    @ConfigurationPropertiesBinding
    public static class CustomTypeConverter implements Converter<String, CustomType> {

        @Override
        public CustomType convert(String source) {
            String[] kv = source.split("-");
            return new CustomType(kv[0], kv[1]);
        }
    }
}

application.properties

config.scalar=key1-value1
config.list=key2-value2,key3-value3

Minimal working sample project is in attachment. converter-failure.zip

Comment From: philwebb

I think this may be due to #34631. We add the converter to an empty FormattingConversionService which will do String -> CustomType conversion but not String -> List<CustomType> conversion.

Comment From: kascaks

All good in 3.2.1. Thanks!