Hi, I'm facing something similar right now, I've configured my webhooks for just Triggers: pullrequest:created, pullrequest:updated.
Anyway, it works when a PR has been created but nothing happens when I push something new on the existing PR (no build are triggered).

Even enabling request History collection, I can see the event triggered, but then no new builds are starting on my PR.

Am i missing something? I don't want repository:push trigger since the build just needs to start when a PR exists.
Thank you!