diff --git a/src/applications/maniphest/storage/ManiphestTransaction.php b/src/applications/maniphest/storage/ManiphestTransaction.php
--- a/src/applications/maniphest/storage/ManiphestTransaction.php
+++ b/src/applications/maniphest/storage/ManiphestTransaction.php
@@ -40,6 +40,22 @@
     return parent::shouldGenerateOldValue();
   }
 
+  public function shouldHideForFeed() {
+    // NOTE: Modular transactions don't currently support this, and it has
+    // very few callsites, and it's publish-time rather than display-time.
+    // This should probably become a supported, display-time behavior. For
+    // discussion, see T12787.
+
+    // Hide "alice created X, a task blocking Y." from feed because it
+    // will almost always appear adjacent to "alice created Y".
+    $is_new = $this->getMetadataValue('blocker.new');
+    if ($is_new) {
+      return true;
+    }
+
+    return parent::shouldHideForFeed();
+  }
+
   public function getRequiredHandlePHIDs() {
     $phids = parent::getRequiredHandlePHIDs();
 
diff --git a/src/applications/maniphest/xaction/ManiphestTaskUnblockTransaction.php b/src/applications/maniphest/xaction/ManiphestTaskUnblockTransaction.php
--- a/src/applications/maniphest/xaction/ManiphestTaskUnblockTransaction.php
+++ b/src/applications/maniphest/xaction/ManiphestTaskUnblockTransaction.php
@@ -9,15 +9,6 @@
     return null;
   }
 
-  public function shouldHideForFeed() {
-    // Hide "alice created X, a task blocking Y." from feed because it
-    // will almost always appear adjacent to "alice created Y".
-    $is_new = $this->getMetadataValue('blocker.new');
-    if ($is_new) {
-      return true;
-    }
-  }
-
   public function getActionName() {
     $old = $this->getOldValue();
     $new = $this->getNewValue();