Volume "reset parameter" sets level to +9dB
My office has recently upgraded to Premiere Pro 2020. In the effect control panel, clicking the "reset parameter" button on either the "Volume" or "Channel Volume" control sets the audio level to +9.0 dB, not 0.0 dB as it had in previous versions.
Matt Stegner commented
This is fixed internally and should be fixed in the next patch.