diff --git a/Tests/test_image_convert.py b/Tests/test_image_convert.py
index f596f009025..c0dbb4fabaa 100644
--- a/Tests/test_image_convert.py
+++ b/Tests/test_image_convert.py
@@ -293,7 +293,7 @@ def test_p2pa_alpha() -> None:
 def test_p2pa_palette() -> None:
     with Image.open("Tests/images/tiny.png") as im:
         im_pa = im.convert("PA")
-    assert im_pa.getpalette() == im.getpalette()
+    assert im_pa.getpalette(None) == im.getpalette()
 
 
 rgb2xyz_matrix = (
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index 51ff69ed521..092f09e5215 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -1250,6 +1250,7 @@ def convert_transparency(
             from . import ImagePalette
 
             new_im.palette = ImagePalette.ImagePalette("RGB", im.getpalette("RGB"))
+            new_im.palette.dirty = 1
         if delete_trns:
             # crash fail if we leave a bytes transparency in an rgb/l mode.
             del new_im.info["transparency"]