All of my iOS simulator suddenly gone

My Xcode and Simulator cannot locate any of my iOS simulators all the sudden. I had to redownload new ios simulators from the Xcode menu.

I did not update my Xcode, so I am curious about what caused it.

In the directory, '/Users/username/Library/Developer/CoreSimulator/Devices/', I was able to find all my previous iOS simulators. Show in the picture

But somehow Xcode and the Simulator program are not picking it up.

Also, on a side note, as I want to see which folder has the actual os files, I toggled 'Calculate All Sizes' in the view options menu, and it somehow changed most of the folders' Modified date, as seen in the screenshot that some contents in the folder are there from a long time ago. Not sure how that changed the date.

My chip is M1 Pro, and running os 14.3.1 Sonoma