Updated Photoshop Beta's generative refill can't be used based on given image

yes -having the samy issue - no longer seems to work in the way it did!

https://community.adobe.com/t5/photoshop-beta-bugs/p-use-ai-to-transform-existing-layer-not-working/idc-p/14622680#M15794

Please read this (in particular the section titled "Supply pertinent information for more timely and effective answers”):
https://community.adobe.com/t5/using-the-community/community-how-to-guide-tips-amp-best-practices/td-p/11601738?page=1

In case you are talking about Photoshop Beta please don’t post on this Forum but on the Beta Forum. 

https://community.adobe.com/t5/photoshop-beta/ct-p/ct-photoshop-beta?page=1&sort=latest_replies&lang=en&tabid=all

same issues with creating any generated effects even with images i create.

Hi there, I ran into this problem with both the newest versions of Photoshop and the Beta. What I did to make this work is the same workflow as previous but did not select the complete photo with the selection when I went into the layers panel to do the generative fill and used the "Oil Painting" for the generative fill query. It worked nicely for me.

One other thing I did, if it still doesn't work for you was and I don't know if this did anything but I did make a duplicate layer of the background prior to adding another channel.

Hope this works. Post here if it does so you can help others.