diff --git a/image/test/gtest/Common.cpp b/image/test/gtest/Common.cpp
index 901c5519bcce8..f7b580ee720f2 100644
--- a/image/test/gtest/Common.cpp
+++ b/image/test/gtest/Common.cpp
@@ -441,6 +441,13 @@ ImageTestCase GreenAVIFTestCase() {
   return ImageTestCase("green.avif", "image/avif", IntSize(100, 100));
 }
 
+ImageTestCase NonzeroReservedAVIFTestCase() {
+  auto testCase = ImageTestCase("hdlr-nonzero-reserved-bug-1727033.avif",
+                                "image/avif", IntSize(1, 1));
+  testCase.mColor = BGRAColor(0x00, 0x00, 0x00, 0xFF);
+  return testCase;
+}
+
 ImageTestCase Transparent10bit420AVIFTestCase() {
   auto testCase =
       ImageTestCase("transparent-green-50pct-10bit-yuv420.avif", "image/avif",
diff --git a/image/test/gtest/Common.h b/image/test/gtest/Common.h
index 16df411c710e0..ad0e857db8514 100644
--- a/image/test/gtest/Common.h
+++ b/image/test/gtest/Common.h
@@ -477,6 +477,7 @@ ImageTestCase GreenIconTestCase();
 ImageTestCase GreenWebPTestCase();
 ImageTestCase GreenAVIFTestCase();
 
+ImageTestCase NonzeroReservedAVIFTestCase();
 ImageTestCase Transparent10bit420AVIFTestCase();
 ImageTestCase Transparent10bit422AVIFTestCase();
 ImageTestCase Transparent10bit444AVIFTestCase();
diff --git a/image/test/gtest/TestDecoders.cpp b/image/test/gtest/TestDecoders.cpp
index 30ec4b404d426..ea64f391d8278 100644
--- a/image/test/gtest/TestDecoders.cpp
+++ b/image/test/gtest/TestDecoders.cpp
@@ -708,6 +708,10 @@ TEST_F(ImageDecoders, AVIFSingleChunk) {
   CheckDecoderSingleChunk(GreenAVIFTestCase());
 }
 
+TEST_F(ImageDecoders, AVIFSingleChunkNonzeroReserved) {
+  CheckDecoderSingleChunk(NonzeroReservedAVIFTestCase());
+}
+
 TEST_F(ImageDecoders, AVIFSingleChunkTransparent10bit420) {
   CheckDecoderSingleChunk(Transparent10bit420AVIFTestCase());
 }
diff --git a/image/test/gtest/hdlr-nonzero-reserved-bug-1727033.avif b/image/test/gtest/hdlr-nonzero-reserved-bug-1727033.avif
new file mode 100644
index 0000000000000..e84ba63e2d1d7
Binary files /dev/null and b/image/test/gtest/hdlr-nonzero-reserved-bug-1727033.avif differ
diff --git a/image/test/gtest/moz.build b/image/test/gtest/moz.build
index c42ff4a7bf55d..b5a5310de2293 100644
--- a/image/test/gtest/moz.build
+++ b/image/test/gtest/moz.build
@@ -100,6 +100,7 @@ TEST_HARNESS_FILES.gtest += [
     "green.jxl",
     "green.png",
     "green.webp",
+    "hdlr-nonzero-reserved-bug-1727033.avif",
     "invalid-truncated-metadata.bmp",
     "large.avif",
     "large.jxl",