A few bugs identified when restarting a course:

• Player Effects aren't cleared
• Inventories aren't refreshed (i.e. consumables aren't refilled)

Fixed in latest commit.
Was as simple as silently leaving and rejoining the course, seems to work as expected.

Just to add to this, when the restart tool is used, the live timer starts at 1 instead of zero. Sounds an easy fix, but I've tried a few different tests and have been unable to get it to work satisfactorily - either the player gains an advantage by being able to move before the timer starts, or the finish time ends up out of sync by up to a second with the displayed time.

Maybe the reset should create a new session, and/or have a small (3-2-1) countdown?

Hmmm, I think you're right with a delay... perhaps to avoid any bugs it should go through the full leave / join cycle but only teleport them right at the end.
Needs some investigation into what that would look like