Unable to read polymorphic types with Morphia with or without the default discriminator

Server Version: 8.0.4
Driver Version: 4.11.5
Morphia Version: 2.4.15

So I have a simple structure:

Interceptor.java

@Entity(discriminatorKey = "type")
public abstract class Interceptor {

    @Id
    protected String id;
    protected String type;

    public Interceptor(String type) {
        this.type = type;
    }
    
    // getters and setters omitted..
}

It's subclasses:

ScriptInterceptor.java

@Entity(discriminator = "script", discriminatorKey = "type")
public class ScriptInterceptor extends Interceptor {

    private String language;
    private String source;

    public ScriptInterceptor() {
        super("script");
    }
    
    // getters and setters omitted...
}

XsltInterceptor.java

@Entity(discriminator = "xslt", discriminatorKey = "type")
public class XsltInterceptor extends Interceptor {

    private String source;

    public XsltInterceptor() {
        super("xslt");
    }
    
    // getters and setters omitted...
}

The document is successfully inserted, but when reading it seems that Morphia is unable to deserialize it. The document looks like this:

The error I'm getting is:

Caused by: org.bson.codecs.configuration.CodecConfigurationException: Failed to decode 'Interceptor'. Decoding errored with: my.package.ScriptInterceptor
............
Caused by: dev.morphia.mapping.MappingException: my.package.ScriptInterceptor
	at dev.morphia.mapping.DiscriminatorLookup.lookup(DiscriminatorLookup.java:69)
	at dev.morphia.mapping.codec.pojo.EntityDecoder.getCodecFromDocument(EntityDecoder.java:105)
	... 84 more
Caused by: java.lang.ClassNotFoundException: my.package.ScriptInterceptor
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(BuiltinClassLoader.java:641)
	at java.base/jdk.internal.loader.ClassLoaders$AppClassLoader.loadClass(ClassLoaders.java:188)
	at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:526)

I already tried to use the default discriminator (_t) but I got the very same error.

I'm really confused right now. Why is this happening?

Start with the discriminator lookup and decoding paths named in the trace: dev/morphia/mapping/DiscriminatorLookup.java and dev/morphia/mapping/codec/pojo/EntityDecoder.java. Reproduce the read using the Interceptor, ScriptInterceptor, and XsltInterceptor mappings, then trace why the discriminator resolves to a class name that cannot be loaded. Done means polymorphic documents decode successfully with either discriminator configuration.