This summary is not the rule. The rule text controls.
This rule has been reserved, which means it doesn't currently contain any content. Courts sometimes set up their rule numbering system with extra spaces for future use. A reserved rule is a placeholder that may be filled in later if the court decides to add a new rule at this spot.
Right now, there's nothing here that affects your case. If you were looking for information under Rule 20, you'll need to check other rules in the Tennessee Rules of Criminal Procedure or ask someone familiar with the current rules where that topic is covered instead. Court rules do get updated over time, so it's possible this space could be used in the future, but as of now it's empty.