BUG: Handling NaN case before dtype conversion pandas-dev#40638

Author: Sudomarko

pandas/core/arrays/numpy_.py

@@ -355,13 +355,17 @@ def to_numpy(  # type: ignore[override]
         copy: bool = False,
         na_value=lib.no_default,
     ) -> np.ndarray:
-        result = np.asarray(self._ndarray, dtype=dtype)
 
-        if (copy or na_value is not lib.no_default) and result is self._ndarray:
-            result = result.copy()
+        temp = self
 
         if na_value is not lib.no_default:
-            result[self.isna()] = na_value
+            temp.fillna(None)
+
+        result = np.asarray(temp._ndarray, dtype=dtype)
+
+        if (copy or na_value is not lib.no_default) and result is temp._ndarray:
+            result = result.copy()
+
 
         return result