After the update 26.6.0 file associations stopped working. Previously, double-clicking on a jpg, tif, or png file opened Photoshop, but now it opens Preview.app. Forcibly changing the file association with the program does not work.
I'm having the same issue. Using Get Info to change a specific file type to open in PS 2025 and choosing Change All does nothing, I can visually see the selected app default back to a different app (Acrobat, Illustrator, etc). Choosing Photoshop 2025 does not stick.