Please help ... There is no shadow in build 2019.1.8f1 !!

i have a very strange problem when i build my game in 2019 version.
if i build only one level, everything is fine, but when i build all of my scenes there isn’t shadow in my game … any guess ?

i have tested a lots of ways but doesn’t work.

Control the setting shadow intensity on your light object. For me i noticed that sometimes it is resetted to zero.