Realm Swift: "Cannot modify managed RLMArray outside of a write transaction.", despite RLMArray being in a transaction?

everyone.

I've recently been using MongoDB Realm for Swift UI and it has been very good so far, but now I'm facing a problem that I have spent a lot of time trying to fix but to no avail.

To begin, I'm creating a simple To Do app to get used to the database, and I have created two entities, the Task, and the TaskGroup.

Naturally, there is a relationship between these two entities and that is a TaskGroup object contains many Task objects using List<Task>, and I would backlink the object using LinkingObjects<TaskGroup>.

Now, the issue is when I add a task group, there is no issues and the new task group is visible on the screen, but all hell breaks loose when I begin to add a task to the task group's tasks property, which is List<Task>, as for some reason, Realm throws an error saying that the task I'm appending is outside the realm transaction, even though it is, and I'm following the Realm tutorial.

I have a created a class to manage realms that I create, which includes a custom configuration (the rest of the code is singleton method and declaration):

class RealmManager
{  
    /* ... */

    public static func Initialize() -> Void
    {
        /* Path to the realm. */
        let path: String = ".../Markdown.realm"

        /* The schema version must be updated every time we modify the schema. */
        var config = Realm.Configuration /* -> */ (
            schemaVersion: 6
        )
        
        config.fileURL = URL(fileURLWithPath: path)
                
        Realm.Configuration.defaultConfiguration = config
    }

    /* ... */
}

Here are the class for the Task and TaskGroup entities:

final class Task: Object, ObjectKeyIdentifiable
{
    // Attributes
    
    @Persisted(primaryKey: true)
    public var id: ObjectId
    
    @Persisted
    var title: String
    
    @Persisted
    var note: String
    
    @Persisted
    var date: Date
    
    @Persisted
    var complete: Bool
    
    @Persisted
    var priority: Int
    
    @Persisted(originProperty: "tasks")
    public var parent_group: LinkingObjects<TaskItemGroup>
    
    /* ... */
}

final class TaskGroup: Object, ObjectKeyIdentifiable
{
    @Persisted(primaryKey: true)
    public var id: ObjectId
    
    @Persisted
    public var title: String
    
    @Persisted
    public var color: String
    
    @Persisted
    public var icon: String
    
    @Persisted
    public var tasks: RealmSwift.List<TaskItem>
    
    /* ... */
}

And finally, here is the class where the issue is (I believe):

struct TaskAddSheet: View
{ 
    /* ... */

    @ObservedRealmObject
    private var m_parent_task_group: TaskItemGroup
    
    init(_ obj: TaskGroup)
    {
        m_parent_task_group = obj
    }
    
    private func AddTask() -> Void
    {
        do
        {
            let realm: Realm = try Realm()
            
            let entry: TaskItem = TaskItem()
            
            try realm.write {
                entry.title = m_title
                entry.note = m_note
                entry.date = m_date
                entry.priority = m_priority
                
                m_parent_task_group.tasks.append(entry)

                realm.add(entry)
            }
        }
        catch
        {
            print("[Insert Error] - \(error.localizedDescription)")
        }
        
        /* Dismiss the current view. */
        m_dismiss_action()
    }

    /* The rest is the view body. */
}

struct TaskGroupAddSheet: View
{
    private func AddTaskGroup() -> Void
    {
        do
        {
            let realm: Realm = try Realm()

            let entry: TaskItemGroup = TaskItemGroup()

            try realm.write {
                entry.title = m_title
                entry.color = m_color
                entry.icon = m_icon
                entry.tasks = RealmSwift.List<TaskItem>()
                
                realm.add(entry)
            }
        }
        catch
        {
            print("[Error] - \(error)")
        }
        
        /* Dismiss the current view. */
        m_dismiss_action()
    }
    
    /* The rest is the view body. */
}

Please let me know if you need more code samples so that I can add them if you need more information.

Thank you.

EDIT: I have trimmed the code and took out any empty initializers, line breaks, etc., to make reading the code clearer.

EDIT 2: I have renamed my entities Task to TaskItem, and TaskGroup to TaskItemGroup.

SOLVED: I needed to write $m_parent_task_group.append(entry) instead, which solved the problem. Now the program adds the tasks to the group without any problems.