Small parts dropped can go throught the ground or explode. I recommend to avoid dropping them on the ground, and instead drop them on another part (container for exemple)
Item drag from part list to inventory in editor can be stuck after loading a vessel (click on the inventory UI to fix the problem)
Kerbal inventory portrait is missing after going on the map (save/load to fix)
Logs may report a message: Ignoring error adding ModuleKISInventory to kerbalEVA_RD (Part): System.NullReferenceException. In spite of it has text referring to an NRE it's not an error. The record itself is INFO level, and just notifies about a known issue. For now there is no solution to avoid this behavior.