Not sure why you have this error, this is probably a bug in the widget.
Maybe you can try to add a dataview that contain both rich text, in that data view, you put the source as microflow or nanoflow and put a delay of 500 ms (either using the delay java action from community commons, or the wait activity from nanoflow commons).
See also https://community.mendix.com/link/space/widgets/questions/118377