diff --git a/services/issue/assignee.go b/services/issue/assignee.go
index c7e24955687f9..a9494b7ab4e16 100644
--- a/services/issue/assignee.go
+++ b/services/issue/assignee.go
@@ -54,6 +54,8 @@ func ToggleAssigneeWithNotify(ctx context.Context, issue *issues_model.Issue, do
 	if err != nil {
 		return false, nil, err
 	}
+	issue.AssigneeID = assigneeID
+	issue.Assignee = assignee
 
 	notify_service.IssueChangeAssignee(ctx, doer, issue, assignee, removed, comment)
 
diff --git a/tests/integration/issue_test.go b/tests/integration/issue_test.go
index f0a5e4f519f96..cef5d9fcc2894 100644
--- a/tests/integration/issue_test.go
+++ b/tests/integration/issue_test.go
@@ -151,6 +151,15 @@ func testNewIssue(t *testing.T, session *TestSession, user, repo, title, content
 	return issueURL
 }
 
+func testIssueAssign(t *testing.T, session *TestSession, repoLink string, issueID, assigneeID int64) {
+	req := NewRequestWithValues(t, "POST", fmt.Sprintf(repoLink+"/issues/assignee?issue_ids=%d", issueID), map[string]string{
+		"_csrf":  GetUserCSRFToken(t, session),
+		"id":     strconv.FormatInt(assigneeID, 10),
+		"action": "", // empty action means assign
+	})
+	session.MakeRequest(t, req, http.StatusOK)
+}
+
 func testIssueAddComment(t *testing.T, session *TestSession, issueURL, content, status string) int64 {
 	req := NewRequest(t, "GET", issueURL)
 	resp := session.MakeRequest(t, req, http.StatusOK)
diff --git a/tests/integration/repo_webhook_test.go b/tests/integration/repo_webhook_test.go
index 89df15b8de8c3..6c73dc2330b38 100644
--- a/tests/integration/repo_webhook_test.go
+++ b/tests/integration/repo_webhook_test.go
@@ -352,6 +352,45 @@ func Test_WebhookIssue(t *testing.T) {
 		assert.Equal(t, "user2/repo1", payloads[0].Issue.Repo.FullName)
 		assert.Equal(t, "Title1", payloads[0].Issue.Title)
 		assert.Equal(t, "Description1", payloads[0].Issue.Body)
+		assert.Positive(t, payloads[0].Issue.Created.Unix())
+		assert.Positive(t, payloads[0].Issue.Updated.Unix())
+	})
+}
+
+func Test_WebhookIssueAssign(t *testing.T) {
+	var payloads []api.PullRequestPayload
+	var triggeredEvent string
+	provider := newMockWebhookProvider(func(r *http.Request) {
+		content, _ := io.ReadAll(r.Body)
+		var payload api.PullRequestPayload
+		err := json.Unmarshal(content, &payload)
+		assert.NoError(t, err)
+		payloads = append(payloads, payload)
+		triggeredEvent = "pull_request_assign"
+	}, http.StatusOK)
+	defer provider.Close()
+
+	user2 := unittest.AssertExistsAndLoadBean(t, &user_model.User{ID: 2})
+	repo1 := unittest.AssertExistsAndLoadBean(t, &repo.Repository{ID: 1})
+
+	onGiteaRun(t, func(t *testing.T, giteaURL *url.URL) {
+		// 1. create a new webhook with special webhook for repo1
+		session := loginUser(t, "user2")
+
+		testAPICreateWebhookForRepo(t, session, "user2", "repo1", provider.URL(), "pull_request_assign")
+
+		// 2. trigger the webhook, issue 2 is a pull request
+		testIssueAssign(t, session, repo1.Link(), 2, user2.ID)
+
+		// 3. validate the webhook is triggered
+		assert.Equal(t, "pull_request_assign", triggeredEvent)
+		assert.Len(t, payloads, 1)
+		assert.EqualValues(t, "assigned", payloads[0].Action)
+		assert.Equal(t, "repo1", payloads[0].PullRequest.Base.Repository.Name)
+		assert.Equal(t, "user2/repo1", payloads[0].PullRequest.Base.Repository.FullName)
+		assert.Equal(t, "issue2", payloads[0].PullRequest.Title)
+		assert.Equal(t, "content for the second issue", payloads[0].PullRequest.Body)
+		assert.Equal(t, user2.ID, payloads[0].PullRequest.Assignee.ID)
 	})
 }