diff --git a/email_validator/validate_email.py b/email_validator/validate_email.py
index 07b398a..ffb5d8e 100644
--- a/email_validator/validate_email.py
+++ b/email_validator/validate_email.py
@@ -120,15 +120,39 @@ def validate_email(
     # data, and I don't know whether the rules really apply in the wild.)
     normalized_local_part = unicodedata.normalize("NFC", ret.local_part)
     if normalized_local_part != ret.local_part:
+        # If the original local part was quoted, NFC normalization keeps
+        # the surrounding quotes. Unquote before re-validating so that
+        # validate_email_local_part (which expects an unquoted value and
+        # re-quotes it when quoted_local_part is True) does not double-escape.
+        if (is_quoted_local_part and len(normalized_local_part) >= 2
+                and normalized_local_part[0] == '"' and normalized_local_part[-1] == '"'):
+            to_validate = ""
+            escaped = False
+            for c in normalized_local_part[1:-1]:
+                if escaped:
+                    to_validate += c
+                    escaped = False
+                elif c == "\\":
+                    escaped = True
+                else:
+                    to_validate += c
+            revalidate_quoted = True
+        else:
+            to_validate = normalized_local_part
+            revalidate_quoted = is_quoted_local_part
         try:
-            validate_email_local_part(normalized_local_part,
-                                      allow_smtputf8=allow_smtputf8,
-                                      allow_empty_local=allow_empty_local,
-                                      quoted_local_part=is_quoted_local_part,
-                                      strict=strict)
+            normalized_local_part_info = validate_email_local_part(
+                to_validate,
+                allow_smtputf8=allow_smtputf8,
+                allow_empty_local=allow_empty_local,
+                quoted_local_part=revalidate_quoted,
+                strict=strict,
+            )
         except EmailSyntaxError as e:
             raise EmailSyntaxError("After Unicode normalization: " + str(e)) from e
-        ret.local_part = normalized_local_part
+        ret.local_part = normalized_local_part_info["local_part"]
+        ret.ascii_local_part = normalized_local_part_info["ascii_local_part"]
+        ret.smtputf8 = normalized_local_part_info["smtputf8"]
 
     # If a quoted local part isn't allowed but is present, now raise an exception.
     # This is done after any exceptions raised by validate_email_local_part so