Image size in thumbnail view is not accurate

The image size (in centimeters) metadata given in the thumbnail view is never accurate (has never been as far as I've seen in last years). I imagine it is generated by a calculation and rounded off in a way that gives a different result from the number Photoshop will give in the 'Image size' panel. It is almost always off by a millimeter in both axis and is differing along files when dpi is different.

In example the long side of image all says 25,1 cm but is actually 25 cm.