Please refer to the following link: https://github.com/Microsoft/Reporting-Services/blob/master/Docs/Get-Started-With-RVC.md#known-issues
Please try to update the report viewer to the latest version. The following is about the bugs fixed by the version information: https://learn.microsoft.com/en-us/sql/reporting-services/release-notes-reporting-services?view= sql-server-ver15
And what browser do you use to render the report?
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