Reminds me of the ice machine on the NOAA ship Pisces, which had an optical sensor to detect when your hand was in front of it to dispense the ice. The problem: dark skin wasn't reflective enough, so it refused to dispense ice for a third of the crew. Jim Crow-ass Ice Machine.
Micahlegitimately this is a big reason it’s important to have diverse product teams! people with different experiences have different perspectives on how something can be misused and will bring up problems that you might have missed even with a good faith attempt at thinking them through