Hi
Encountered an issue with shadow casting of smaller objects with Lightmass. In the screenshot you can see pencils only cast occlusion but no shadow from the light, so I scaled on the of the prop for testing and got the shadow alright. I have a good enough lightmap resolution. Also please find the Lightmass and Directional Light settings in the screenshot.
Help Needed Here 
The problem is the lightmap resolution. Go in Lightmap density mode (alt + 0) and post a screenshot of it here. What is the current lightmap resolution on the table?
Lightmap resolution is 2048 for the table in the latest build (missing shadows)
here is the screenshot
Oh, I just noticed this now sry. You gotta go lower with the Static Lighting Level Scale (inside the Lightmap settings) to something like 0.15 (dont go lower than this) to have smaller shadow details.
Edit: Added additional info
Thanks a ton @NasteX for the quick help. I have tried the value till 0.3 in previous projects and never had to go below that. This is a new update for me.
Cheers