The update method is currently breaking when using data that affects the query.

For example,

const dave = await app.service('people').create({ name: 'Dave' })

// Now mutate AND query the name property.
const result = await app
  .service('people')
  .update(dave._id, { name: 'Marshal' }, { query: { name: 'Dave' } })

The problem originates here:

We have updated the data, but then this following _findOrGet is using the original query. Because our data mutated a value in that query, the request throws a NotFound (even though the record was updated); This likely needs to be handled similarly to patch/remove.

I am currently working on a mongoJoinQuery for a project that will ultimately end up in feathers-fletching. So I am taking a deep dive in the new Mongo adapter. I will eventually create a PR for this problem and any others I stumble across.