ui5-list MultiSelect is not willing to work when items are added via todo-item custom element (rc15)

[nemethmik]

Hello!
I am implementing the Todo Sample application, with Lit and I found that MultiSelect mode of ui5-list doesn't work when the todo items are included in a web component. It works great when I directly include the ui5-li elements.

@customElement("todo-list")
class TodoList extends LitElement {
    inlineTodoItems = true
    @property({type:Array}) items!:TTodoItem[]
    @property() selectionChange!:(CustomEvent)=>void
    @property() handleDelete!:(number)=>void
    @property() handleEdit!:(number)=>void
    static override get styles():CSSResult { return css` ... ` } 
    override render():TemplateResult { return html`
    <ui5-list mode="MultiSelect" @selectionChange=${(e:Event):void => {this.selectionChange(e)}}>
      ${this.items.map(todo => html`
        ${this.inlineTodoItems ? 
            html`<ui5-li-custom key=${todo.id} ?selected=${todo.done} data-key=${todo.id} class=${this.hidden ? "hidden" : ""} >
                <div class="li-content">
                    <span class="li-content-text">${todo.text} - finish before: ${todo.deadline}</span>
                    <div class="li-content-actions">
                        <ui5-button class="edit-btn" @click=${(e:Event):void => {this.handleEdit(e)}}>Edit</ui5-button>
                        <ui5-button design="Negative" @click=${(e:Event):void => {this.handleDelete(e)}}>Delete</ui5-button>
                    </div>
                </div>
            </ui5-li-custom>` : ``}
        ${this.inlineTodoItems ?
            html`
            <todo-item
                key=${todo.id}
                id=${todo.id}
                text=${todo.text}
                .deadline=${todo.deadline}
                .done=${todo.done}
                .handleDelete=${this.handleDelete}
                .handleEdit=${this.handleEdit}></todo-item>
            ` : ``
        }`
      )}
    </ui5-list>
    `}
}

This might be a bug. To me this is not a big deal, but for the UI5 programmers this might be interesting.
Check out the explanation video ui5-list MultiSelect mode Shows No Checkboxes from within todoitem customelement (shadow DOM CSS?), I intentionally added the todo-items twice one directly with ui5-li and once via a todo-item custom element. What do you think?