Agent#getInstance() is null

[MCAki06]

JDK Version: 17
Paper (1.20.4)

RuntimeTransformer is called in onEnabled()
Startup has -Djdk.attach.allowAttachSelf=true argument

When I try to call RuntimeTransfomer I get the following error:

[19:17:03 WARN]: java.lang.NullPointerException: Cannot invoke "me.yamakaja.runtimetransformer.agent.Agent.process(java.lang.Class[])" because the return value of "me.yamakaja.runtimetransformer.agent.Agent.getInstance()" is null
[19:17:03 WARN]:        at Rhodium.jar//me.yamakaja.runtimetransformer.TransformerUtils.attachAgent(TransformerUtils.java:25)
[19:17:03 WARN]:        at Rhodium.jar//me.yamakaja.runtimetransformer.RuntimeTransformer.<init>(RuntimeTransformer.java:43)
[19:17:03 WARN]:        at Rhodium.jar//me.immcaki.Main.onEnable(Main.java:789)
[19:17:03 WARN]:        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:287)
...

POM file is:

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-shade-plugin</artifactId>
                <version>3.6.0</version>
                <executions>
                    <execution>
                        <phase>package</phase>
                        <goals>
                            <goal>shade</goal>
                        </goals>
                        <configuration>
                            <artifactSet>
                                <includes>
                                    <include>me.yamakaja.runtimetransformer:api</include>
                                    <include>me.yamakaja.runtimetransformer:agent</include>
                                </includes>
                            </artifactSet>
                        </configuration>
                    </execution>
                </executions>
            </plugin>
            ...... specialsource-maven-plugin
        </plugins>
    </build>
...
    <dependencies>
        <dependency>
            <groupId>me.yamakaja.runtimetransformer</groupId>
            <artifactId>api</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>me.yamakaja.runtimetransformer</groupId>
            <artifactId>agent</artifactId>
            <version>1.0-SNAPSHOT</version>
        </dependency>

       <dependency>
                <groupId>org.spigotmc</groupId>
                <artifactId>spigot</artifactId>
                <version>1.20.4-R0.1-SNAPSHOT</version>
                <scope>provided</scope>
                <classifier>remapped-mojang</classifier>
        </dependency>
...