If you open this file in VSCode ...

/* global somePromise */
async function foo() {
  const { baz } = this;

  await somePromise;

  console.log(baz, this.bar);
}

await foo();

You'll see a red-squiggly on the this.bar text. Activating the "Replace this.bar with destructured bar" quick fix will hoist bar into the destructuring statement, giving you this:

/* global somePromise */
async function foo() {
  const {baz, bar} = this;

  await somePromise;

  console.log(baz, bar);
}

await foo();

The problem with modified code is that bar's value is not guaranteed to be the same pre-await as it is post-await. (E.g. if somePromise is responsible for initializing this.bar, then bar will hold the uninitialized value.)

It's good that this doesn't happen automatically on --fix, but this suggestion should either be disabled in this case, or include some sort of warning to the user.