You're troubleshooting a web application and notice that an event is not being captured during the capturing phase as expected. What could be a potential reason for this event not being captured?

One potential reason for an event not being captured during the capturing phase is that the event is not properly attached to the target element. Capturing phase events need to be registered correctly using methods like addEventListener with the true parameter to enable the capturing phase. Other options may affect event handling but are not specific to the capturing phase.