diff --git a/Tests/test_image_convert.py b/Tests/test_image_convert.py
index 547a6c2c678..fdb96c5e4fb 100644
--- a/Tests/test_image_convert.py
+++ b/Tests/test_image_convert.py
@@ -290,6 +290,18 @@ def test_p2pa_palette() -> None:
     assert im_pa.getpalette() == im.getpalette()
 
 
+def test_pa2p_truly_drops_alpha() -> None:
+    im = Image.frombytes("P", (2, 1), bytes([0, 1])).convert("PA")
+    im.putpalette(bytes([255, 0, 0, 7, 0, 255, 0, 9]), "RGBA")
+    im.putalpha(Image.frombytes("L", (2, 1), bytes([240, 220])))
+    assert im.get_flattened_data() == ((0, 240), (1, 220))  # Matches the alpha band
+    im_p = im.convert("P")
+    assert im_p.palette is not None
+    assert im_p.im.getpalettemode() == im_p.palette.mode == "RGB"
+    rgba_data = im_p.convert("RGBA").get_flattened_data()
+    assert rgba_data == ((255, 0, 0, 255), (0, 255, 0, 255))
+
+
 def test_matrix_illegal_conversion() -> None:
     # Arrange
     im = hopper("CMYK")
diff --git a/src/PIL/Image.py b/src/PIL/Image.py
index ddbaec20a05..1c1f5af0f01 100644
--- a/src/PIL/Image.py
+++ b/src/PIL/Image.py
@@ -1242,9 +1242,8 @@ def convert_transparency(
 
         new_im = self._new(im)
         if mode in ("P", "PA") and palette != Palette.ADAPTIVE:
-            from . import ImagePalette
-
-            new_im.palette = ImagePalette.ImagePalette("RGB", im.getpalette("RGB"))
+            # Install the original image's palette into the new copy
+            new_im.putpalette(im.getpalette("RGB"))
         if delete_trns:
             # crash fail if we leave a bytes transparency in an rgb/l mode.
             del new_im.info["transparency"]