registerCallback with selectImage stopped working

[Arsenalist]

This is in react:

  import EmailEditor, { UnlayerOptions } from "react-email-editor";

  ...

  const internalOnReady = () => {
    emailEditorRef.current.editor.registerCallback("selectImage", (a, b) =>
      console.log("registering callback"),
    );
  };

  ...

<EmailEditor ref={emailEditorRef} onReady={internalOnReady} />

The selectImage callback is not called when clicking the Image upload button. This used to work fine a few days ago.