diff --git a/app/Http/Controllers/Webhook/Bitbucket.php b/app/Http/Controllers/Webhook/Bitbucket.php
index e06a14e0bf..489de7e5c5 100644
--- a/app/Http/Controllers/Webhook/Bitbucket.php
+++ b/app/Http/Controllers/Webhook/Bitbucket.php
@@ -84,7 +84,11 @@ class Bitbucket extends Controller
             $failure_key = $this->manualWebhookFailureRateLimitKey($request, 'bitbucket', $full_name, $branch);
             // A redelivery of the same signed payload is one guess.
             $failure_attempt = $this->manualWebhookSignedPayloadAttempt($request, $x_bitbucket_token);
-            $applications = $this->manualWebhookApplications(Application::query()->where('git_branch', $branch), $full_name);
+            $applications = Application::query();
+            if ($x_bitbucket_event !== 'pullrequest:rejected' && $x_bitbucket_event !== 'pullrequest:fulfilled') {
+                $applications->where('git_branch', $branch);
+            }
+            $applications = $this->manualWebhookApplications($applications, $full_name);
             if ($applications->isEmpty()) {
                 return $this->unauthenticatedManualWebhookResponse($failure_key, $failure_attempt);
             }
diff --git a/tests/Feature/BitbucketPullRequestWebhookRoutingTest.php b/tests/Feature/BitbucketPullRequestWebhookRoutingTest.php
new file mode 100644
index 0000000000..f186c30c36
--- /dev/null
+++ b/tests/Feature/BitbucketPullRequestWebhookRoutingTest.php
@@ -0,0 +1,105 @@
+<?php
+
+use App\Actions\Application\CleanupPreviewDeployment;
+use App\Models\Application;
+use App\Models\ApplicationPreview;
+use App\Models\Environment;
+use App\Models\Project;
+use App\Models\Server;
+use App\Models\Team;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Queue;
+
+uses(RefreshDatabase::class);
+
+function createBitbucketPullRequestWebhookApplication(): Application
+{
+    $team = Team::factory()->create();
+    $project = Project::factory()->create(['team_id' => $team->id]);
+    $environment = Environment::factory()->create(['project_id' => $project->id]);
+    $server = Server::factory()->create(['team_id' => $team->id]);
+    $server->settings->update([
+        'is_reachable' => true,
+        'is_usable' => true,
+        'force_disabled' => false,
+    ]);
+    $destination = $server->standaloneDockers()->firstOrFail();
+
+    return Application::create([
+        'name' => 'bitbucket-pr-webhook-app',
+        'git_repository' => 'https://bitbucket.org/test-org/test-repo',
+        'git_branch' => 'main',
+        'build_pack' => 'nixpacks',
+        'ports_exposes' => '3000',
+        'environment_id' => $environment->id,
+        'destination_id' => $destination->id,
+        'destination_type' => $destination->getMorphClass(),
+    ]);
+}
+
+function sendBitbucketPullRequestWebhook(Application $application, string $event, string $destinationBranch)
+{
+    $body = json_encode([
+        'repository' => [
+            'full_name' => 'test-org/test-repo',
+            'uuid' => '{repository-uuid}',
+        ],
+        'pullrequest' => [
+            'id' => 42,
+            'title' => 'Stacked change',
+            'links' => ['html' => ['href' => 'https://bitbucket.org/test-org/test-repo/pull-requests/42']],
+            'source' => [
+                'branch' => ['name' => 'feature/child'],
+                'commit' => ['hash' => 'abc1234def5678'],
+                'repository' => ['uuid' => '{repository-uuid}'],
+            ],
+            'destination' => [
+                'branch' => ['name' => $destinationBranch],
+                'repository' => ['uuid' => '{repository-uuid}'],
+            ],
+        ],
+    ], JSON_THROW_ON_ERROR);
+
+    return test()->call('POST', '/webhooks/source/bitbucket/events/manual', [], [], [], [
+        'HTTP_X-Event-Key' => $event,
+        'HTTP_X-Hub-Signature' => 'sha256='.hash_hmac('sha256', $body, $application->manual_webhook_secret_bitbucket),
+        'CONTENT_TYPE' => 'application/json',
+    ], $body);
+}
+
+it('cleans up the preview of a closed pull request after the destination branch changes', function (string $event) {
+    $application = createBitbucketPullRequestWebhookApplication();
+    $preview = ApplicationPreview::create([
+        'application_id' => $application->id,
+        'pull_request_id' => 42,
+        'pull_request_html_url' => 'https://bitbucket.org/test-org/test-repo/pull-requests/42',
+        'git_type' => 'bitbucket',
+    ]);
+
+    CleanupPreviewDeployment::shouldRun()
+        ->once()
+        ->withArgs(fn (Application $cleanedApplication, int $pullRequestId, ApplicationPreview $cleanedPreview): bool => $cleanedApplication->is($application)
+            && $pullRequestId === 42
+            && $cleanedPreview->is($preview))
+        ->andReturn([
+            'cancelled_deployments' => 0,
+            'killed_containers' => 0,
+            'status' => 'success',
+        ]);
+
+    $response = sendBitbucketPullRequestWebhook($application, $event, 'feature/parent');
+
+    $response->assertOk();
+    expect($response->getContent())->toContain('Preview deployment closed.');
+})->with(['pullrequest:fulfilled', 'pullrequest:rejected']);
+
+it('continues to filter opened pull requests by destination branch', function () {
+    Queue::fake();
+    $application = createBitbucketPullRequestWebhookApplication();
+    $application->settings->update(['is_preview_deployments_enabled' => true]);
+
+    $response = sendBitbucketPullRequestWebhook($application, 'pullrequest:created', 'feature/parent');
+
+    $response->assertOk();
+    expect(ApplicationPreview::where('application_id', $application->id)->exists())->toBeFalse();
+});