Difference between context.name and context.name.action

[ajmalab]

Hello everyone. I can see that context.name can either take the value of the event name or a combination of event name and action. However I could not find any documentation on how this works. My assumption was that when the app receives a Webhooks event (say pull_request), it would simply transform it into the WebhookEvent object with context.name = pull_request and context.payload.action = synchronize. In what scenarios will this event be structured such that context.name = pull_request.synchronize ? I tried inspecting the events on smee.io, and via logs, but can see that the latter scenario has never occurred.
Any info is appreciated, thanks!