[1.6.x] Fixed #20781 -- Fixed _has_changed regression with MultiValueField

Thanks Tim Graham for the report.
Backport of 02b0106d from master.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/forms/fields.py b/django/forms/fields.py
index 7711cd65ad..a794c02e9f 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -1025,7 +1025,7 @@ class MultiValueField(Field):
             if not isinstance(initial, list):
                 initial = self.widget.decompress(initial)
         for field, initial, data in zip(self.fields, initial, data):
-            if field._has_changed(initial, data):
+            if field._has_changed(field.to_python(initial), data):
                 return True
         return False