fix(richtext-lexical): error when changing block collapsed state in rare cases (#9421)

Author: AlessioGr

packages/richtext-lexical/src/features/blocks/client/component/index.tsx

@@ -259,7 +259,7 @@ export const BlockComponent: React.FC<Props> = (props) => {
     (changedCollapsed: boolean) => {
       void getDocPreferences().then((currentDocPreferences) => {
         const currentFieldPreferences =
-          currentDocPreferences?.fields[parentLexicalRichTextField.name]
+          currentDocPreferences?.fields?.[parentLexicalRichTextField.name]
 
         const collapsedArray = currentFieldPreferences?.collapsed
 

packages/richtext-lexical/src/utilities/buildInitialState.ts

@@ -88,7 +88,7 @@ export async function buildInitialState({
       initialState[id].formState = formStateResult
 
       if (node.type === 'block') {
-        const currentFieldPreferences = context.preferences?.fields[context.field.name]
+        const currentFieldPreferences = context.preferences?.fields?.[context.field.name]
         const collapsedArray = currentFieldPreferences?.collapsed
         if (collapsedArray && collapsedArray.includes(id)) {
           initialState[id].collapsed = true