fix mid-air-collision test failure
fix mid-air-collision test failure

Summary: this test was added in D3051364 but not rebased into D3041505

Reviewed By: samwgoldman

Differential Revision: D3056482

fb-gh-sync-id: f33ebfa2902b2b3085cf34ec8a8a5064040d5877
shipit-source-id: f33ebfa2902b2b3085cf34ec8a8a5064040d5877

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