Index: src/applications/differential/query/DifferentialRevisionQuery.php
===================================================================
--- src/applications/differential/query/DifferentialRevisionQuery.php
+++ src/applications/differential/query/DifferentialRevisionQuery.php
@@ -429,6 +429,13 @@
         continue;
       }
 
+      if ($this->getViewer()->isOmnipotent()) {
+        // The viewer is omnipotent. Allow the revision to load even without
+        // a repository.
+        $revision->attachRepository(null);
+        continue;
+      }
+
       // The revision has an associated repository, and the viewer can't see
       // it, and the viewer has no special capabilities. Filter out this
       // revision.
Index: src/applications/policy/filter/PhabricatorPolicyFilter.php
===================================================================
--- src/applications/policy/filter/PhabricatorPolicyFilter.php
+++ src/applications/policy/filter/PhabricatorPolicyFilter.php
@@ -259,6 +259,15 @@
       return;
     }
 
+    if ($this->viewer->isOmnipotent()) {
+      // Never raise policy exceptions for the omnipotent viewer. Although we
+      // will never normally issue a policy rejection for the omnipotent
+      // viewer, we can end up here when queries blanket reject objects that
+      // have failed to load, without distinguishing between nonexistent and
+      // nonvisible objects.
+      return;
+    }
+
     $capobj = PhabricatorPolicyCapability::getCapabilityByKey($capability);
     $rejection = null;
     if ($capobj) {