img with span problem

   const blocksFromHtml = htmlToDraft(this.props.value);
    const { contentBlocks, entityMap } = blocksFromHtml;
    const contentState = ContentState.createFromBlockArray(contentBlocks, entityMap);
    const editorState = EditorState.createWithContent(contentState);
    this.state = {
      editorState,
      loading: false
    };
<Editor editorState={this.state.editorState} defaultEditorState={this.state.editorState}/>

here props value just is img tag with src

it will throw an error Unknown DraftEntity key: null.

why ????

and if i pass

<p></p>
<img src="..."/>

it will work

and if i pass

<p></p>
<img src="..."/>
<span>it will invisible or miss in editor<span>

// or

<p></p>
<img src="..."/>it will invisible or miss in editor

it will invisible all the element after img tag

Hope to get the answer

Reproduce the issue through htmlToDraft, ContentState.createFromBlockArray, and the Editor component using the HTML examples in the report. Trace the img handling and verify that an image followed by a span or later content neither raises the Unknown DraftEntity key error nor hides the following elements.