redux почему не удаляется элемент из store?

почему не работает этот код?

case 'REMOVE_TODO':
    return {
        ...state,
        current: state.current?.map(item => {
            if(item.id === action.payload.itemId) {
                item.sections.map(section => {
                    if(section.id === action.payload.sectionId) {
                        section.todos.filter(todo => {
                            if(todo.id !== action.payload.todoId) {
                                return todo
                            }
                        })
                        return section
                    }
                })
            }
            return item
        })
    }

Код initalState:

const initialState: IState = {
    items: [
        { 
            id: 1, 
            name: 'Work week-7', 
            desc: 'Lorem ipsum dolor sit amet consectetur adipisicing elit. Et nostrum porro id ea exercitationem quam, suscipit nesciunt perspiciatis sunt nulla.', 
            url: '/d/1', 
            imageUrl: 'https://images.unsplash.com/photo-1593642634315-48f5414c3ad9?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80'`введите сюда код`,
            sections: [
                {id: 1, name: 'Section1', todos: [
                    {id: 1, name: 'todo1', completed: false},
                    {id: 2, name: 'todo2', completed: false},
                    {id: 3, name: 'todo3', completed: false},
                ]},
                {id: 2, name: 'Section2', todos: [
                    {id: 1, name: 'todo1', completed: false},
                    {id: 2, name: 'todo2', completed: false},
                    {id: 3, name: 'todo3', completed: false},
                ]},
            ]
        },
        { 
            id: 2, 
            name: 'Work week-8', 
            desc: 'Lorem ipsum dolor sit amet consectetur adipisicing elit. Et nostrum porro id ea exercitationem quam, suscipit nesciunt perspiciatis sunt nulla.', 
            url: '/d/2', 
            imageUrl: 'https://images.unsplash.com/photo-1486312338219-ce68d2c6f44d?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1352&q=80', 
            sections: [
                {id: 1, name: 'Section1', todos: [
                    {id: 1, name: 'todo1', completed: false},
                    {id: 2, name: 'todo2', completed: false},
                    {id: 3, name: 'todo3', completed: false},
                ]},
                {id: 2, name: 'Section2', todos: [
                    {id: 1, name: 'todo1', completed: false},
                    {id: 2, name: 'todo2', completed: false},
                    {id: 3, name: 'todo3', completed: false},
                ]},
            ]
        },
        { 
            id: 3, 
            name: 'Learn languages', 
            desc: 'Lorem ipsum dolor sit amet consectetur adipisicing elit. Et nostrum porro id ea exercitationem quam, suscipit nesciunt perspiciatis sunt nulla.', 
            url: '/d/3', 
            imageUrl: 'https://images.unsplash.com/photo-1520756739397-7d1218d4efea?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=1350&q=80', 
            sections: [
                {id: 1, name: 'English', todos: [
                    {id: 1, name: 'grammar', completed: false},
                    {id: 2, name: 'words', completed: false},
                    {id: 3, name: 'read text', completed: false},
                ]},
                {id: 2, name: 'French', todos: [
                    {id: 1, name: 'grammar', completed: false},
                    {id: 2, name: 'words', completed: false},
                    {id: 3, name: 'read text', completed: false},
                ]},
            ]
        },
    ],
    current: null
}