The canopy hinge(s) can be on the front, rear and side. The consequences of an mis- or un- latched canopy are different in each case:

Front: a bit more noise. You may not notice until landing. Don't ask how I know.

Rear: Instantly gone. Pilot unhooks and lands.

Side: Instant distraction for pilot, especially if pilot grabs canopy "in time". Some very rare pilots know which rudder pedal to push to keep canopy down if it comes loose. An L-33 canopy can be mis-latched if it's some 2mm high.

Glider curriculums are silent on handling canopies coming loose.

It feels good to chant "Do the checklist", but people make mistakes and need to be trained in handling screw ups.