fix hidden shows briefly when mentioning unknown user

src/components/HTMLEngineProvider/HTMLRenderers/MentionUserRenderer.tsx

@@ -4,9 +4,9 @@ import isEmpty from 'lodash/isEmpty';
 import React from 'react';
 import {StyleSheet} from 'react-native';
 import type {TextStyle} from 'react-native';
+import {useOnyx} from 'react-native-onyx';
 import type {CustomRendererProps, TPhrasing, TText} from 'react-native-render-html';
 import {TNodeChildrenRenderer} from 'react-native-render-html';
-import {usePersonalDetails} from '@components/OnyxProvider';
 import {ShowContextMenuContext, showContextMenuForReport} from '@components/ShowContextMenuContext';
 import Text from '@components/Text';
 import UserDetailsTooltip from '@components/UserDetailsTooltip';
@@ -20,6 +20,7 @@ import Navigation from '@libs/Navigation/Navigation';
 import * as PersonalDetailsUtils from '@libs/PersonalDetailsUtils';
 import * as ReportUtils from '@libs/ReportUtils';
 import CONST from '@src/CONST';
+import ONYXKEYS from '@src/ONYXKEYS';
 import ROUTES from '@src/ROUTES';
 import type {Route} from '@src/ROUTES';
 import asMutable from '@src/types/utils/asMutable';
@@ -31,7 +32,7 @@ function MentionUserRenderer({style, tnode, TDefaultRenderer, currentUserPersona
     const styles = useThemeStyles();
     const StyleUtils = useStyleUtils();
     const htmlAttribAccountID = tnode.attributes.accountid;
-    const personalDetails = usePersonalDetails() || CONST.EMPTY_OBJECT;
+    const [personalDetails] = useOnyx(ONYXKEYS.PERSONAL_DETAILS_LIST);
     const htmlAttributeAccountID = tnode.attributes.accountid;
 
     let accountID: number;
@@ -56,7 +57,7 @@ function MentionUserRenderer({style, tnode, TDefaultRenderer, currentUserPersona
         return displayText.split('@').at(0);
     };
 
-    if (!isEmpty(htmlAttribAccountID)) {
+    if (!isEmpty(htmlAttribAccountID) && personalDetails?.[htmlAttribAccountID]) {
         const user = personalDetails[htmlAttribAccountID];
         accountID = parseInt(htmlAttribAccountID, 10);
         mentionDisplayText = LocalePhoneNumber.formatPhoneNumber(user?.login ?? '') || PersonalDetailsUtils.getDisplayNameOrDefault(user);