"No render context, scripts disabled" in Report Viewer

The scripts will not run on any charts when viewing my report in the Report Viewer component. The scripts do run in the designer’s preview, and they do also run when the report is emailed using system.report.executeAndDistribute.

The console shows a log message from each chart: “WARN reporting.XYChart - No render context, scripts disabled.”

This has been fixed in 7.9.1