message: fix .firstChainLoc assignment in handleUnitChainsSimple
diff: @@ -186,7 +186,7 @@ export namespace Stats {
  // full chain
  stats.chainCount += 1;
  if (stats.chainCount === 1) {
  - Location.set(stats.firstChainLoc, unit, elements[offsets[cI]]);
  + Location.set(stats.firstChainLoc, unit, offsets[cI]);
  }
  }
  }
  