diff --git a/modules/video_coding/svc/scalability_structure_full_svc.cc b/modules/video_coding/svc/scalability_structure_full_svc.cc
index c489b60..5454622 100644
--- a/modules/video_coding/svc/scalability_structure_full_svc.cc
+++ b/modules/video_coding/svc/scalability_structure_full_svc.cc
@@ -188,7 +188,6 @@
         // No frame reference top layer frame, so no need save it into a buffer.
         if (num_temporal_layers_ > 2 || sid < num_spatial_layers_ - 1) {
           config.Update(BufferIndex(sid, /*tid=*/1));
-          can_reference_t1_frame_for_spatial_id_.set(sid);
         }
         spatial_dependency_buffer_id = BufferIndex(sid, /*tid=*/1);
       }
@@ -246,6 +245,10 @@
 
 GenericFrameInfo ScalabilityStructureFullSvc::OnEncodeDone(
     const LayerFrameConfig& config) {
+  if (config.TemporalId() == 1) {
+    can_reference_t1_frame_for_spatial_id_.set(config.SpatialId());
+  }
+
   GenericFrameInfo frame_info;
   frame_info.spatial_id = config.SpatialId();
   frame_info.temporal_id = config.TemporalId();
diff --git a/modules/video_coding/svc/scalability_structure_key_svc.cc b/modules/video_coding/svc/scalability_structure_key_svc.cc
index cfc89a3..9399c0c 100644
--- a/modules/video_coding/svc/scalability_structure_key_svc.cc
+++ b/modules/video_coding/svc/scalability_structure_key_svc.cc
@@ -148,7 +148,6 @@
     config.Id(kDelta).S(sid).T(1).Reference(BufferIndex(sid, /*tid=*/0));
     if (num_temporal_layers_ > 2) {
       config.Update(BufferIndex(sid, /*tid=*/1));
-      can_reference_t1_frame_for_spatial_id_.set(sid);
     }
   }
   return configs;
@@ -223,6 +222,10 @@
 
 GenericFrameInfo ScalabilityStructureKeySvc::OnEncodeDone(
     const LayerFrameConfig& config) {
+  if (config.TemporalId() == 1) {
+    can_reference_t1_frame_for_spatial_id_.set(config.SpatialId());
+  }
+
   GenericFrameInfo frame_info;
   frame_info.spatial_id = config.SpatialId();
   frame_info.temporal_id = config.TemporalId();
diff --git a/modules/video_coding/svc/scalability_structure_key_svc_unittest.cc b/modules/video_coding/svc/scalability_structure_key_svc_unittest.cc
index 752f710..34ec747 100644
--- a/modules/video_coding/svc/scalability_structure_key_svc_unittest.cc
+++ b/modules/video_coding/svc/scalability_structure_key_svc_unittest.cc
@@ -52,6 +52,29 @@
 }
 
 TEST(ScalabilityStructureL3T3KeyTest,
+     SkipT1FrameByEncoderKeepsReferencesValid) {
+  std::vector<GenericFrameInfo> frames;
+  ScalabilityStructureL3T3Key structure;
+  ScalabilityStructureWrapper wrapper(structure);
+
+  // 1st 2 temporal units (T0 and T2)
+  wrapper.GenerateFrames(/*num_temporal_units=*/2, frames);
+  // Simulate T1 frame dropped by the encoder,
+  // i.e. retrieve config, but skip calling OnEncodeDone.
+  structure.NextFrameConfig(/*restart=*/false);
+  // one more temporal units (T2)
+  wrapper.GenerateFrames(/*num_temporal_units=*/1, frames);
+
+  ASSERT_THAT(frames, SizeIs(9));
+  EXPECT_EQ(frames[0].temporal_id, 0);
+  EXPECT_EQ(frames[3].temporal_id, 2);
+  // T1 frames were dropped by the encoder.
+  EXPECT_EQ(frames[6].temporal_id, 2);
+
+  EXPECT_TRUE(wrapper.FrameReferencesAreValid(frames));
+}
+
+TEST(ScalabilityStructureL3T3KeyTest,
      ReenablingSpatialLayerBeforeMissedT0FrameDoesntTriggerAKeyFrame) {
   ScalabilityStructureL3T3Key structure;
   ScalabilityStructureWrapper wrapper(structure);
diff --git a/modules/video_coding/svc/scalability_structure_l3t3_unittest.cc b/modules/video_coding/svc/scalability_structure_l3t3_unittest.cc
index 1a3dc8b..ca66fa8 100644
--- a/modules/video_coding/svc/scalability_structure_l3t3_unittest.cc
+++ b/modules/video_coding/svc/scalability_structure_l3t3_unittest.cc
@@ -9,6 +9,8 @@
  */
 #include "modules/video_coding/svc/scalability_structure_l3t3.h"
 
+#include <vector>
+
 #include "modules/video_coding/svc/scalability_structure_test_helpers.h"
 #include "test/gmock.h"
 #include "test/gtest.h"
@@ -44,6 +46,28 @@
   EXPECT_EQ(frames[0].temporal_id, 2);
 }
 
+TEST(ScalabilityStructureL3T3Test, SkipT1FrameByEncoderKeepsReferencesValid) {
+  std::vector<GenericFrameInfo> frames;
+  ScalabilityStructureL3T3 structure;
+  ScalabilityStructureWrapper wrapper(structure);
+
+  // 1st 2 temporal units (T0 and T2)
+  wrapper.GenerateFrames(/*num_temporal_units=*/2, frames);
+  // Simulate T1 frame dropped by the encoder,
+  // i.e. retrieve config, but skip calling OnEncodeDone.
+  structure.NextFrameConfig(/*restart=*/false);
+  // one more temporal units (T2)
+  wrapper.GenerateFrames(/*num_temporal_units=*/1, frames);
+
+  ASSERT_THAT(frames, SizeIs(9));
+  EXPECT_EQ(frames[0].temporal_id, 0);
+  EXPECT_EQ(frames[3].temporal_id, 2);
+  // T1 frame was dropped by the encoder.
+  EXPECT_EQ(frames[6].temporal_id, 2);
+
+  EXPECT_TRUE(wrapper.FrameReferencesAreValid(frames));
+}
+
 TEST(ScalabilityStructureL3T3Test, SwitchSpatialLayerBeforeT1Frame) {
   ScalabilityStructureL3T3 structure;
   ScalabilityStructureWrapper wrapper(structure);