diff --git a/services/surfaceflinger/Scheduler/VSyncPredictor.cpp b/services/surfaceflinger/Scheduler/VSyncPredictor.cpp
index dd3c4b0..0644aca 100644
--- a/services/surfaceflinger/Scheduler/VSyncPredictor.cpp
+++ b/services/surfaceflinger/Scheduler/VSyncPredictor.cpp
@@ -360,7 +360,11 @@
     purgeTimelines(now);
 
     for (auto& timeline : mTimelines) {
-        if (timeline.validUntil() && timeline.validUntil()->ns() > vsync) {
+        const bool isVsyncValid = FlagManager::getInstance().vrr_bugfix_24q4()
+                ? timeline.isWithin(TimePoint::fromNs(vsync)) ==
+                        VsyncTimeline::VsyncOnTimeline::Unique
+                : timeline.validUntil() && timeline.validUntil()->ns() > vsync;
+        if (isVsyncValid) {
             return timeline.isVSyncInPhase(model, vsync, frameRate);
         }
     }
@@ -395,8 +399,14 @@
         mLastCommittedVsync = TimePoint::fromNs(0);
 
     } else {
-        mTimelines.back().freeze(
-                TimePoint::fromNs(mLastCommittedVsync.ns() + mIdealPeriod.ns() / 2));
+        if (FlagManager::getInstance().vrr_bugfix_24q4()) {
+            // We need to freeze the timeline at the committed vsync so that we don't
+            // overshoot the deadline.
+            mTimelines.back().freeze(mLastCommittedVsync);
+        } else {
+            mTimelines.back().freeze(
+                    TimePoint::fromNs(mLastCommittedVsync.ns() + mIdealPeriod.ns() / 2));
+        }
     }
     mTimelines.emplace_back(mLastCommittedVsync, mIdealPeriod, renderRate);
     purgeTimelines(TimePoint::fromNs(mClock->now()));
@@ -611,7 +621,10 @@
 
     while (mTimelines.size() > 1) {
         const auto validUntilOpt = mTimelines.front().validUntil();
-        if (validUntilOpt && *validUntilOpt < now) {
+        const bool isTimelineOutDated = FlagManager::getInstance().vrr_bugfix_24q4()
+                ? mTimelines.front().isWithin(now) == VsyncTimeline::VsyncOnTimeline::Outside
+                : validUntilOpt && *validUntilOpt < now;
+        if (isTimelineOutDated) {
             mTimelines.pop_front();
         } else {
             break;
@@ -660,9 +673,12 @@
             vsyncTime += missedVsync.fixup.ns();
             ATRACE_FORMAT_INSTANT("lastFrameMissed");
         } else if (mightBackpressure && lastVsyncOpt) {
-            // lastVsyncOpt is based on the old timeline before we shifted it. we should correct it
-            // first before trying to use it.
-            lastVsyncOpt = snapToVsyncAlignedWithRenderRate(model, *lastVsyncOpt);
+            if (!FlagManager::getInstance().vrr_bugfix_24q4()) {
+                // lastVsyncOpt does not need to be corrected with the new rate, and
+                // it should be used as is to avoid skipping a frame when changing rates are
+                // aligned at vsync time.
+                lastVsyncOpt = snapToVsyncAlignedWithRenderRate(model, *lastVsyncOpt);
+            }
             const auto vsyncDiff = vsyncTime - *lastVsyncOpt;
             if (vsyncDiff <= minFramePeriodOpt->ns() - threshold) {
                 // avoid a duplicate vsync
@@ -681,7 +697,10 @@
     }
 
     ATRACE_FORMAT_INSTANT("vsync in %.2fms", float(vsyncTime - TimePoint::now().ns()) / 1e6f);
-    if (mValidUntil && vsyncTime > mValidUntil->ns()) {
+    const bool isVsyncInvalid = FlagManager::getInstance().vrr_bugfix_24q4()
+            ? isWithin(TimePoint::fromNs(vsyncTime)) == VsyncOnTimeline::Outside
+            : mValidUntil && vsyncTime > mValidUntil->ns();
+    if (isVsyncInvalid) {
         ATRACE_FORMAT_INSTANT("no longer valid for vsync in %.2f",
                               static_cast<float>(vsyncTime - TimePoint::now().ns()) / 1e6f);
         return std::nullopt;
diff --git a/services/surfaceflinger/Scheduler/VSyncPredictor.h b/services/surfaceflinger/Scheduler/VSyncPredictor.h
index 8ce61d8..66a7d71 100644
--- a/services/surfaceflinger/Scheduler/VSyncPredictor.h
+++ b/services/surfaceflinger/Scheduler/VSyncPredictor.h
@@ -106,6 +106,24 @@
         void shiftVsyncSequence(Duration phase);
         void setRenderRate(std::optional<Fps> renderRateOpt) { mRenderRateOpt = renderRateOpt; }
 
+        enum class VsyncOnTimeline {
+            Unique,  // Within timeline, not shared with next timeline.
+            Shared,  // Within timeline, shared with next timeline.
+            Outside, // Outside of the timeline.
+        };
+        VsyncOnTimeline isWithin(TimePoint vsync) {
+            const auto threshold = mIdealPeriod.ns() / 2;
+            if (!mValidUntil || vsync.ns() < mValidUntil->ns() - threshold) {
+                // if mValidUntil is absent then timeline is not frozen and
+                // vsync should be unique to that timeline.
+                return VsyncOnTimeline::Unique;
+            }
+            if (vsync.ns() > mValidUntil->ns() + threshold) {
+                return VsyncOnTimeline::Outside;
+            }
+            return VsyncOnTimeline::Shared;
+        }
+
     private:
         nsecs_t snapToVsyncAlignedWithRenderRate(Model model, nsecs_t vsync);
         VsyncSequence getVsyncSequenceLocked(Model, nsecs_t vsync);
diff --git a/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp b/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp
index 5109ea6..f36a8a6 100644
--- a/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp
+++ b/services/surfaceflinger/tests/unittests/VSyncPredictorTest.cpp
@@ -673,6 +673,36 @@
     EXPECT_THAT(tracker.nextAnticipatedVSyncTimeFrom(mNow + 5100), Eq(mNow + 6 * mPeriod));
 }
 
+TEST_F(VSyncPredictorTest, setRenderRateWhenRenderRateGoesDown) {
+    SET_FLAG_FOR_TEST(flags::vrr_config, true);
+    SET_FLAG_FOR_TEST(flags::vrr_bugfix_24q4, true);
+
+    const int32_t kGroup = 0;
+    const auto kResolution = ui::Size(1920, 1080);
+    const auto vsyncRate = Fps::fromPeriodNsecs(500);
+    const auto minFrameRate = Fps::fromPeriodNsecs(1000);
+    hal::VrrConfig vrrConfig;
+    vrrConfig.minFrameIntervalNs = minFrameRate.getPeriodNsecs();
+    const ftl::NonNull<DisplayModePtr> kMode =
+            ftl::as_non_null(createDisplayModeBuilder(DisplayModeId(0), vsyncRate, kGroup,
+                                                      kResolution, DEFAULT_DISPLAY_ID)
+                                     .setVrrConfig(std::move(vrrConfig))
+                                     .build());
+
+    VSyncPredictor vrrTracker{std::make_unique<ClockWrapper>(mClock), kMode, kHistorySize,
+                              kMinimumSamplesForPrediction, kOutlierTolerancePercent};
+
+    Fps frameRate = Fps::fromPeriodNsecs(1000);
+    vrrTracker.setRenderRate(frameRate, /*applyImmediately*/ false);
+    vrrTracker.addVsyncTimestamp(0);
+    EXPECT_EQ(1000, vrrTracker.nextAnticipatedVSyncTimeFrom(700));
+    EXPECT_EQ(2000, vrrTracker.nextAnticipatedVSyncTimeFrom(1000, 1000));
+
+    frameRate = Fps::fromPeriodNsecs(3000);
+    vrrTracker.setRenderRate(frameRate, /*applyImmediately*/ false);
+    EXPECT_TRUE(vrrTracker.isVSyncInPhase(2000, frameRate));
+}
+
 TEST_F(VSyncPredictorTest, setRenderRateHighIsAppliedImmediately) {
     SET_FLAG_FOR_TEST(flags::vrr_config, true);