dotnet / dotnet/wpf

The AttachProperty which is bound did not work when the lib's xaml prefix is different from app's xaml prefix

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Description

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/t/The-AttachProperty-which-is-bound-did-no/10507797)._

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[severity:It bothers me. A fix would be nice]

![aa](https://github.com/dotnet/wpf/assets/105205215/d04280cc-2ee1-4e4d-99e2-c71a8541463b)

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### Original Comments

#### Feedback Bot on 11/6/2023, 08:02 AM:

(private comment, text removed)
#### Ann Yang [MSFT] on 11/6/2023, 01:06 PM:

(private comment, text removed)
#### 聪 李 on 11/6/2023, 02:12 PM:

(private comment, text removed)
#### Feedback Bot on 11/6/2023, 03:13 PM:

(private comment, text removed)
#### Feedback Bot on 2/5/2024, 00:15 PM:

(private comment, text removed)

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### Original Solutions
(no solutions)

Repro - [AttachPropertyIssue.zip](https://github.com/user-attachments/files/16013491/AttachPropertyIssue.zip)

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