Observed :
Wood log dragged and dropped from inventory truck directly onto rebuildable house inventory disappeared (most of them anyways).

Only about a dozen logs out of 50 were transferred (instead of the maximum of 15), leaving only 20 logs in the truck. The remaining logs disappeared. I tried drag and drop again, and the same thing happened.

Sorry i'm not sure about the real numbers, but they definitely disappeared.

Steps :

1. Park the truck against a rebuildable house (see screenshot)

2. Drag and drop wood logs from truck log space inventory (50 max) to house inventory (there was 50 logs in truck)

Wooden log dragged and dropped directly from inventory truck to rebuildable house inventory should be counted normally and should not disappear.