Typescript 更新为Angular 17后的可选链运算符&&问题

之前，我的Angular 是13，我的组件工作正常！自那以后，我已经升级到了Angel的其他版本，目前是16版.我想修复一个warning，因为我有一个语法问题.

src/app/.../annexes.component.html:6:65 - warning NG8107: The left side of this optional chain 
operation does not include 'null' or 'undefined' in its type, therefore the '?.' 
operator can be replaced with the '.' operator.     

 <h2 *ngIf="annexeDetails">{{ annexeDetails?.TITRE }} - {{ id }}</h2>  

src/app/.../annexes.component.ts:15:16
templateUrl: './annexes.component.html',
                      ~~~~~~~~~~~~~~~~~~~~~~~~~~
Error occurs in the template of component AnnexesComponent.

和

Warning: src/app/.../corporate-actions-details-confirm-modal/corporate-actions-details-confirm-modal.component.html:32:60 - 

warning NG8107: The left side of this optional chain operation does not include 'null' 
or 'undefined' in its type, therefore the '?.' operator can be replaced with the '.' operator.      

32 - {{ ostDetail?.LIMITEDATE | date: "d MMMM y" }}.
                                                              ~~~~~~~~~~

src/app/.../corporate-actions-details-confirm-modal/corporate-actions-details-confirm-modal.component.ts:14:16
14   templateUrl: './corporate-actions-details-confirm-modal.component.html',

我换掉了

<h2 *ngIf="annexeDetails">{{ annexeDetails?.TITRE }} - {{ id }}</h2>  

使用

<h2 *ngIf="annexeDetails">{{ annexeDetails.TITRE }} - {{ id }}</h2>

和 the second

{{ ostDetail?.LIMITEDATE | date: "d MMMM y" }}

使用

{{ ostDetail.LIMITEDATE | date: "d MMMM y" }}

但它不适用于这些新的修改，因为ostDetail可以是null也可以是undefined.

我不知道如何解决这个问题.我将不得不返回到版本13吗？