Custom Lightbox "rel" not working for widget

First I want to say this is a great plugin so thank you for all your hard work.

I have the widget on my website and have set the custom lightbox rel to “lightbox” in the widget but it doesn’t seem to get generated into the code so images just open up in a new window.

Setting the custom rel in on the settings page works ok with the proper rel setting allowing lightbox to work.

Thanks for looking into this.

https://www.ads-software.com/plugins/alpine-photo-tile-for-flickr/