Save interop IFD when converting Exif to bytes

Tests/test_image.py

@@ -752,9 +752,14 @@ class TestImage:
                 4098: 1704,
             }
 
+            reloaded_exif = Image.Exif()
+            reloaded_exif.load(exif.tobytes())
+            assert reloaded_exif.get_ifd(0xA005) == exif.get_ifd(0xA005)
+
     def test_exif_ifd(self):
-        im = Image.open("Tests/images/flower.jpg")
+        with Image.open("Tests/images/flower.jpg") as im:
-        exif = im.getexif()
+            exif = im.getexif()
+        del exif.get_ifd(0x8769)[0xA005]
 
         reloaded_exif = Image.Exif()
         reloaded_exif.load(exif.tobytes())

src/PIL/Image.py

@@ -3373,6 +3373,13 @@ class Exif(MutableMapping):
         for tag, value in self.items():
             if tag in [0x8769, 0x8225] and not isinstance(value, dict):
                 value = self.get_ifd(tag)
+                if (
+                    tag == 0x8769
+                    and 0xA005 in value
+                    and not isinstance(value[0xA005], dict)
+                ):
+                    value = value.copy()
+                    value[0xA005] = self.get_ifd(0xA005)
             ifd[tag] = value
         return b"Exif\x00\x00" + head + ifd.tobytes(offset)
 

src/PIL/TiffTags.py

@@ -184,6 +184,7 @@ TAGS_V2 = {
     34665: ("ExifIFD", LONG, 1),
     34675: ("ICCProfile", UNDEFINED, 1),
     34853: ("GPSInfoIFD", LONG, 1),
+    40965: ("InteroperabilityIFD", LONG, 1),
     # MPInfo
     45056: ("MPFVersion", UNDEFINED, 1),
     45057: ("NumberOfImages", LONG, 1),