NullReferenceException with Microsoft.Data.SqlClient 5.2.0 and with event handler for Backup.PercentComplete

In our app we reference both NuGet-Packages Microsoft.SqlServer.SqlManagementObjects and Microsoft.Data.SqlClient.
We use SMO for many DB-related tasks, incl. Backup of the app databases.
We refresh the NuGet references regularly, actually we use Microsoft.SqlServer.SqlManagementObjects 171.30.0 and Microsoft.Data.SqlClient 5.1.5.
Everything worked fine until we updated Microsoft.Data.SqlClient to the actual version 5.2.0. Now our backup code throws NullReferenceException. As a workaround we switched back to Microsoft.Data.SqlClient 5.1.5.
We were able to reproduce the issue with the sample from https://learn.microsoft.com/en-us/sql/relational-databases/server-management-objects-smo/tasks/backing-up-and-restoring-databases-and-transaction-logs?view=sql-server-ver16#backing-up-databases-and-transaction-logs-in-visual-c
The only difference is the added event handler for Backup.PercentComplete. With it, the sample throws NullReferenceException when calling Backup.SqlBackup() and using SqlClient 5.2.0. The same code works fine with SqlClient 5.1.5 or earlier.

The sample is attached to the issue.
MS_SMO_BackupBug.zip

从附加的 MS_SMO_BackupBug.zip 和链接的 SMO backup sample 开始，重点关注 Backup.PercentComplete 处理程序和 Backup.SqlBackup() 调用。将行为与 Microsoft.Data.SqlClient 5.1.5 和 5.2.0 进行比较，然后验证在处理程序保持启用的情况下，sample 在 5.2.0 上能够完成且不会出现 NullReferenceException。