When I use the Image Size command (CMD + OPT + I or Image>Image Size) in Photoshop, it completely destroys the image file. I tried the same process on two other Macs with the same file (copied from Mac to Mac) and it worked just fine on the other two Macs, so it is not the image file.
There must be a bug/malfunciton in Photoshop, but I can't figure out what it is or how to fix it.
The other two Macs that it worked on the one is identical to mine, a MacBook Pro 16" M1 Pro, the other is a 12 year old MacPro 5,1 tower running Photoshop CS6. Both of those successfully resized the image.