Fix.

Author: davidmorgan

build_runner_core/lib/src/generate/build.dart

@@ -913,15 +913,15 @@ class Build {
     var firstNode = assetGraph.get(outputs.first)!;
     final firstNodeState = firstNode.generatedNodeState!;
 
-    /*if (firstNodeState.result == null) {
+    if (firstNodeState.result == null) {
       if (logFine) {
         _logger.fine(
           'Build ${renderer.build(forInput, outputs)} because '
-          'it was skipped.',
+          'it was optional and is now needed.',
         );
       }
       return true;
-    }*/
+    }
 
     final inputs = firstNodeState.inputs;
     /*if (logFine) {