Instantiating new Document in NestJS with mongoose crashes

So I'm following the NestJS docs on MongoDB, and I'm running into a problem.

Let's say I got this schema

// cat.model.ts
import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
import { Document } from 'mongoose';

@Schema()
export class Cat extends Document {
  @Prop()
  name: string;
  @Prop()
  info: string;

  constructor(dto: CreateCatDTO) {
    super();
    this.name = dto.name;
    // some algorithm to do stuff which I don't want to happen in the service
    // since it's for the Cat model (SOLID)
    this.info = dto.name + algorithmResultBlah;
  }
}

export const CatSchema = SchemaFactory.createForClass(Cat);

But.. when I instantiate that in the service

// cat.service.ts
import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { Model } from 'mongoose';
import { Cat } from './interfaces/cat.model';

@Injectable()
export class CatsService {
  constructor(@InjectModel("Cat") private readonly catRepository: Model<Cat>) {}

  async create(dto: CreateCatDTO) {
    const cat = new Cat(dto); 
    // I have to make a new instance to do some processing in the model..
    // I don't want to do that in the service based on an interface because clutter
    this.catRepository.create(cat);
  }
}

The code above compiles fine, but when I call the function it gives the following error:

TypeError: Cannot read property 'plugin' of undefined
    at Cat.Document.$__setSchema (~\node_modules\mongoose\lib\document.js:2883:10)
    at new Document (~\node_modules\mongoose\lib\document.js:82:10)
    at new Cat (~\dist\melding\domain\cat.js:7:9)

How can I get this to work? I've been scratching my head (and google) on this for a week now and I have tried so many things.