Hi,
Yes, this was a bug that has been fixed in v2.2.0 (available now).
If you would like to modify the file name on your current version, you can click the small gear icon next to the Report Format dropdown then modify the 'File Name Format' Validator Setting.
Once you update, you may have to reset your settings by clicking on the gear icon next to Report Format dropdown. Then on the Reset Tab, Click the 'Reset to Default Settings' button.
Regards,
Brad
Currently (v.2.1.3) output is named "opencdisc-report-<datetime>". It looks logical to change word "opencdisc" to "pinnacle21".