AnalysisDriver.createWorkOrderForResult() should check AnalysisContext.aboutToComputeResult() first.

pkg/analyzer/lib/src/task/driver.dart

Index: pkg/analyzer/lib/src/task/driver.dart
diff --git a/pkg/analyzer/lib/src/task/driver.dart b/pkg/analyzer/lib/src/task/driver.dart
index cb4da98ff0c61f2e14733dac1e00c60b9ae22c2d..7ff82876dc0d18e624e8b762319a0eb0461fed0f 100644
--- a/pkg/analyzer/lib/src/task/driver.dart
+++ b/pkg/analyzer/lib/src/task/driver.dart
@@ -165,6 +165,9 @@ class AnalysisDriver {
         state == CacheState.IN_PROCESS) {
       return null;
     }
+    if (context.aboutToComputeResult(entry, result)) {
+      return null;
+    }
     TaskDescriptor taskDescriptor = taskManager.findTask(target, result);
     if (taskDescriptor == null) {
       return null;