This summary is not the rule. The rule text controls.
This rule is marked "reserved," which means it doesn't contain any actual content right now. Courts sometimes leave a placeholder like this when they remove an old rule or plan to add a new one later. The number stays in place so the numbering system for the rest of the rules doesn't have to change.
If you're looking through the Tennessee Rules of Criminal Procedure and come across Rule 26, there's nothing here to follow or apply. You'll need to look at the surrounding rules to find the guidance you need, since this spot is intentionally left empty for now.