Don't merge with previous from state on form changes

Signed-off-by: Oliver Sand <oliver.sand@sda-se.com>

.changeset/eighty-rabbits-fail.md

@@ -0,0 +1,5 @@
+---
+'@backstage/plugin-scaffolder': patch
+---
+
+Don't merge with previous from state on form changes.

plugins/scaffolder/src/components/TemplatePage/TemplatePage.tsx

@@ -150,8 +150,8 @@ export const TemplatePage = () => {
   const handleFormReset = () => setFormState({});
 
   const handleChange = useCallback(
-    (e: IChangeEvent) => setFormState({ ...formState, ...e.formData }),
-    [setFormState, formState],
+    (e: IChangeEvent) => setFormState(e.formData),
+    [setFormState],
   );
 
   const handleCreate = async () => {