JNI error on Android when passing Enum to native method

I have enum class that was created by Parser by using new Info("name").enumerate(). When I pass it to native method (field setter), my app crashes with following error:

A/queim.tremotes: java_vm_ext.cc:577] JNI DETECTED ERROR IN APPLICATION: attempt to access field int org.bytedeco.javacpp.tools.Generator$IntEnum.value from an object argument of type org.equeim.libtremotesf.Server$ProxyType: 0x6b
    java_vm_ext.cc:577]     in call to GetIntField
    java_vm_ext.cc:577]     from org.equeim.libtremotesf.Server org.equeim.libtremotesf.Server.proxyType(org.equeim.libtremotesf.Server$ProxyType)
A/queim.tremotes: runtime.cc:655] Runtime aborting...

That's what generated JNI method looks like:

JNIEXPORT jobject JNICALL Java_org_equeim_libtremotesf_Server_proxyType__Lorg_equeim_libtremotesf_Server_00024ProxyType_2(JNIEnv* env, jobject obj, jobject arg0) {
    libtremotesf::Server* ptr = (libtremotesf::Server*)jlong_to_ptr(env->GetLongField(obj, JavaCPP_addressFID));
    if (ptr == NULL) {
        env->ThrowNew(JavaCPP_getClass(env, 7), "This pointer address is NULL.");
        return 0;
    }
    jlong position = env->GetLongField(obj, JavaCPP_positionFID);
    ptr += position;
    if (arg0 == NULL) {
        env->ThrowNew(JavaCPP_getClass(env, 7), "Enum for argument 0 is NULL.");
        return 0;
    }
    libtremotesf::Server::ProxyType val0 = (libtremotesf::Server::ProxyType)env->GetIntField(arg0, JavaCPP_intValueFID);
    jobject rarg = obj;
    ptr->proxyType = val0;
    return rarg;
}

This happens on Android 11 on Pixel 4A 5G.