generative fill / Painting effect

One of the applications that I like the most since Photoshop includes the Generative fill is to create painting effects with this tool (as explained in this tutorial https://www.youtube.com/shorts/pzIGYTH13VA).

Since the last version (v26) and the change of Firefly model  the result of the “painted effect” with generative fill is of very low quality and loses the realism that the previous versions achieved.
I attach an example where you can see how in the new version the quality of the exact same effect is much worse.
Any idea how to make this not happen?

gracias,
MT