Fix imported messages not getting thread relation

Eric Eastwoodrequested to merge
fix-import-not-adding-thread-relation into develop

As discovered in !2391 (merged),

  • Fix imported messages not getting thread relation
  • Fix tests not even running the assertions we thought that they were

Follow-up to !2313 (merged)

Part of #2609 (closed)

Edited by Eric Eastwood

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