After an update last week, my photos all decided they were going to open with the default option rather than photo viewer.
Apart from that I haven't noticed any change since updating.
Since installing Windows 11 I do notice that every so often, if I have a folder open with a mixture of HTML files and PNG files in it, the folder appears to lock itself - so if I double click the files nothing happens and they don't open - if I tap the address bar and hit enter - the folder works and allows me to open the files again.