bug(Dialog): 多级弹窗如果设置IsDraggable 为false 则子级的弹窗的IsBackdrop不正常

[rehee]

Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

.net 版本 8.0
模式 wasm
使用dialogservice 的多级弹窗.
如果子弹窗的IsDraggable=false, 则IsBackdrop不工作.

Expected Behavior

我也不知道是不是本来就是这样设计的. 我寻思是不是IsDraggable=false 的时候也可以关闭子弹窗

Interactive render mode

Interactive WebAssembly (Client-side rendering (CSR) using Blazor WebAssembly)

Steps To Reproduce

MultiDialogs.zip

1. home中有一个按钮. 按下以后会调用dialogservice再弹出一个home.
2. 把Home.razor.cs line 24 的 IsDraggable = true, 注释掉. 或者设置为false
3. 再弹窗中再次触发子级弹窗
4. 子弹窗的窗口将与父弹窗完全重合
5. 子弹窗无法点击遮罩关闭

Exceptions (if any)

No response

.NET Version

NET8.0

Anything else?

No response

[bb-auto]

@rehee Thank you for filing this issue. In order for us to investigate this issue, please provide a minimalistic repro project that illustrates the problem.

[rehee]

当我提交以后发现官网的例子也不行. 多级弹窗第二级 就没法点击遮罩关闭了

Bootstrap.Blazor.-.-.Google.Chrome.2025-09-09.23-06-39.mp4

[ArgoZhang]

@rehee 尽快修复一下