diff --git a/src/pillow_avif/_avif.c b/src/pillow_avif/_avif.c
index 0fece9e..6669d45 100644
--- a/src/pillow_avif/_avif.c
+++ b/src/pillow_avif/_avif.c
@@ -790,6 +790,14 @@ AvifDecoderNew(PyObject *self_, PyObject *args) {
         max_threads = default_max_threads;
     }
     self->decoder->maxThreads = max_threads;
+#endif
+#if AVIF_VERSION >= 90200
+    // Turn off libavif's 'clap' (clean aperture) property validation.
+    self->decoder->strictFlags &= ~AVIF_STRICT_CLAP_VALID;
+    // Allow the PixelInformationProperty ('pixi') to be missing in AV1 image
+    // items. libheif v1.11.0 and older does not add the 'pixi' item property to
+    // AV1 image items.
+    self->decoder->strictFlags &= ~AVIF_STRICT_PIXI_REQUIRED;
 #endif
     self->decoder->codecChoice = codec;
 
diff --git a/tests/images/chimera-missing-pixi.avif b/tests/images/chimera-missing-pixi.avif
new file mode 100644
index 0000000..4039547
Binary files /dev/null and b/tests/images/chimera-missing-pixi.avif differ
diff --git a/tests/test_file_avif.py b/tests/test_file_avif.py
index 8c0096e..7cd1fe1 100644
--- a/tests/test_file_avif.py
+++ b/tests/test_file_avif.py
@@ -565,6 +565,13 @@ def test_decoder_upsampling_invalid(self):
         finally:
             AvifImagePlugin.CHROMA_UPSAMPLING = "auto"
 
+    def test_decoder_strict_flags(self):
+        # This would fail if full avif strictFlags were enabled
+        with Image.open(
+            "%s/tests/images/chimera-missing-pixi.avif.avif" % CURR_DIR
+        ) as im:
+            assert im.size == (480, 270)
+
 
 class TestAvifAnimation:
     @contextmanager