I am NOT saying this IS the case, but I have seen this happen on several occasions, including myself.
Rider, is looking at the R Button & Shifter, press buttons HEAR the CLUNK, look behind, and hit the THROTTLE.
Bike goes FORWARD!
Why? Because the Bike was NEVER in Reverse.
Hearing the CLUNK is not a guarantee the Bike is in Reverse. You are only in Reverse IF/WHEN that light comes on.
Yeah I know one would think Not Me, but ones realization of a situation does not always align with REALITY.
AJ