StateError: Bad state: Future already completed

[sentry-io]

Sentry Issue: INTIFACE-CENTRAL-N

StateError: Bad state: Future already completed
  File "sorter.dart", line 23, in MessageSorter.prepareMessage.<fn>
...
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[qdot]

We need to check that futures aren't completed before completing them. This is a little weird though because it means we're possibly getting back duplicates or running resolution multiple times?