Sequelize .save not working with custom array getter/setter

Question

So I'm using an edited version of How can I have a datatype of array in mysql Sequelize instance? to save arrays in my database.

E.g.

likes: {
  type: Sequelize.STRING,
  allowNull: false,
  defaultValue: '[]',
  get() {
    return JSON.parse(this.getDataValue('likes'))
  },
  set(val) {
    console.log(JSON.stringify(val))
    this.setDataValue('likes',JSON.stringify(val));
  }
}

Then I'm editing the "likes" value with something similar to this:

function updootChange(postId, creatorId){
  // CreatorId here is the person to up/down doot for. Yes i copied the reply function and changed it.
  return new Promise((res,rej)=>{
    Post.findOne({
      where: {
        id: postId
      }
    }).then(async(r)=>{
      if(r.likes.includes(creatorId)){
        r.likes = r.likes.filter(item => item !== creatorId)
        await r.save();
        res(-1)
      }else{
        r.likes.push(creatorId)
        
        await r.save();
        res(1)
      }
    }).catch((e)=>{
      console.log(e);
      rej()
    })
  })
}

And although there is no errors, the likes array is never changed.