Webhooks not sending all data

This is on the public GitLab so I think it's the enterprise edition (sorry if that's not correct).

Summary

I could be doing something 100% incorrect, but I'm not getting all of the data from webhooks. If I click the test button, I get everything. However, if I just create an issue or a merge request I don't get hardly any data in the payload.

Steps to reproduce

Create issue webhook and click test. Then create an actual issue and submit it.

What is the current bug behavior?

Clicking the test button works fine, but creating the issue (which I believe should be the same) only gives a very small amount of data.

What is the expected correct behavior?

All of the relevant JSON fields should be filled.

Relevant logs and/or screenshots

Clicking test:

Actually creating an issue:

Here's the struct and just the code used to log:

// Package p contains an HTTP Cloud Function.
package p

import (
	"encoding/json"
	"fmt"
	"html"
	"io/ioutil"
	"log"
	"net/http"
	"time"
)

type GitLab struct {
	ObjectKind string `json:"object_kind"`
	User       struct {
		Name      string `json:"name"`
		Username  string `json:"username"`
		AvatarURL string `json:"avatar_url"`
	} `json:"user"`
	Project struct {
		ID                int         `json:"id"`
		Name              string      `json:"name"`
		Description       string      `json:"description"`
		WebURL            string      `json:"web_url"`
		AvatarURL         interface{} `json:"avatar_url"`
		GitSSHURL         string      `json:"git_ssh_url"`
		GitHTTPURL        string      `json:"git_http_url"`
		Namespace         string      `json:"namespace"`
		VisibilityLevel   int         `json:"visibility_level"`
		PathWithNamespace string      `json:"path_with_namespace"`
		DefaultBranch     string      `json:"default_branch"`
		Homepage          string      `json:"homepage"`
		URL               string      `json:"url"`
		SSHURL            string      `json:"ssh_url"`
		HTTPURL           string      `json:"http_url"`
	} `json:"project"`
	Repository struct {
		Name        string `json:"name"`
		URL         string `json:"url"`
		Description string `json:"description"`
		Homepage    string `json:"homepage"`
	} `json:"repository"`
	ObjectAttributes struct {
		ID          int         `json:"id"`
		Title       string      `json:"title"`
		AssigneeIds []int       `json:"assignee_ids"`
		AssigneeID  int         `json:"assignee_id"`
		AuthorID    int         `json:"author_id"`
		ProjectID   int         `json:"project_id"`
		CreatedAt   time.Time   `json:"created_at"`
		UpdatedAt   time.Time   `json:"updated_at"`
		Position    int         `json:"position"`
		BranchName  interface{} `json:"branch_name"`
		Description string      `json:"description"`
		MilestoneID interface{} `json:"milestone_id"`
		State       string      `json:"state"`
		Iid         int         `json:"iid"`
		URL         string      `json:"url"`
		Action      string      `json:"action"`
	} `json:"object_attributes"`
	Assignees []struct {
		Name      string `json:"name"`
		Username  string `json:"username"`
		AvatarURL string `json:"avatar_url"`
	} `json:"assignees"`
	Assignee struct {
		Name      string `json:"name"`
		Username  string `json:"username"`
		AvatarURL string `json:"avatar_url"`
	} `json:"assignee"`
	Labels []struct {
		ID          int       `json:"id"`
		Title       string    `json:"title"`
		Color       string    `json:"color"`
		ProjectID   int       `json:"project_id"`
		CreatedAt   time.Time `json:"created_at"`
		UpdatedAt   time.Time `json:"updated_at"`
		Template    bool      `json:"template"`
		Description string    `json:"description"`
		Type        string    `json:"type"`
		GroupID     int       `json:"group_id"`
	} `json:"labels"`
	Changes struct {
		UpdatedByID struct {
			Previous interface{} `json:"previous"`
			Current  int         `json:"current"`
		} `json:"updated_by_id"`
		UpdatedAt struct {
			Previous string `json:"previous"`
			Current  string `json:"current"`
		} `json:"updated_at"`
		Labels struct {
			Previous []struct {
				ID          int       `json:"id"`
				Title       string    `json:"title"`
				Color       string    `json:"color"`
				ProjectID   int       `json:"project_id"`
				CreatedAt   time.Time `json:"created_at"`
				UpdatedAt   time.Time `json:"updated_at"`
				Template    bool      `json:"template"`
				Description string    `json:"description"`
				Type        string    `json:"type"`
				GroupID     int       `json:"group_id"`
			} `json:"previous"`
			Current []struct {
				ID          int       `json:"id"`
				Title       string    `json:"title"`
				Color       string    `json:"color"`
				ProjectID   int       `json:"project_id"`
				CreatedAt   time.Time `json:"created_at"`
				UpdatedAt   time.Time `json:"updated_at"`
				Template    bool      `json:"template"`
				Description string    `json:"description"`
				Type        string    `json:"type"`
				GroupID     int       `json:"group_id"`
			} `json:"current"`
		} `json:"labels"`
	} `json:"changes"`
}


func GLTest(w http.ResponseWriter, r *http.Request) {
	var gitlab GitLab
	
	body, err := ioutil.ReadAll(r.Body)
	if err != nil {
		log.Panic(err)
	}
	json.Unmarshal(body, &gitlab)

	fmt.Fprint(w, html.EscapeString(gitlab.User.Name))
	log.Print(gitlab.Repository.Name)
	log.Print(gitlab.User.Username)
	log.Print(gitlab.ObjectAttributes.Title)
	log.Print(gitlab.ObjectAttributes.AuthorID)
        log.Print(gitlab.ObjectAttributes.URL)
        log.Print(gitlab.ObjectAttributes.Description)
        log.Print(gitlab)
}

I apologize in advance if I'm just stupid.