Shadow around object ofter converting materials from 2.79 to 2.82

I want to migrate from blender 2.79 to 2.82 but i have some problems like this
shadow around objects (cycles material mode)

To me it looks like something is in the volume slot
If you are using the latest experimental version of 2.79b it should be perfectly visible in 2.80+. Since the current cycles branch is still in there. But you should use the “append” command. Don’t just open the file.