Welcome to the forum, @sbaygani!
How are you resizing the image? Using Image ▶ Adjust ▶ Size...?
I tested by opening the Bridge sample, setting unit of length to
feet, setting the value to pixel width/height/depth to
0.1, then running Image ▶ Adjust ▶ Size.... Afterward, the physical pixel size (as shown in the Image ▶ Properties...) dialog adjusted accordingly, to
0.2 width and height, such that the image status still said 51.2 feet x 51.2 feet.