Custom simple value converter not used on read

[ghost]

Issue appears when upgrading from 3.1.4 to 3.2.0

Example application, run test to reproduce: https://github.com/stephan-joeres-olx/jdbc-enum-conversion-bug

When enums are saved as lowercase Strings in DB, then it was possible to map them to uppercase Enums using a reading converter. This does not work any longer in 3.2.0. MappingRelationalConverter prefers default String to Enum mapping over the custom converter. The custom reading converter is not being used and the mapping is not successful.

Reading from DB produces: java.lang.IllegalArgumentException: No enum constant MyEnum.first

Converters are registered as this:

@Configuration
class JdbcConfig : AbstractJdbcConfiguration() {
    override fun userConverters(): List<*> = listOf(
        MyEnum.MyEnumReadingConverter(),
        MyEnum.MyEnumWritingConverter()
    )
}

enum class MyEnum {
    FIRST,
    SECOND;

    @ReadingConverter
    class MyEnumReadingConverter : Converter<String, MyEnum> {
        override fun convert(source: String): MyEnum {
            return MyEnum.valueOf(source.uppercase())
        }
    }

    @WritingConverter
    class MyEnumWritingConverter : Converter<MyEnum, String> {
        override fun convert(source: MyEnum): String {
            return source.toString().lowercase()
        }
    }
}