I can confirm this. After lockpicking the police car, it started alarming and had no loot.
A check of my log showed the following error:
NullReferenceException: Object reference not set to an instance of an object
at (wrapper dynamic-method) LootManager.DMD<LootManager::LootContainerOpened>(LootManager,TileEntityLootContainer,int,FastTags)
at GameManager.lootContainerOpened (TileEntityLootContainer _te, LocalPlayerUI _playerUI, System.Int32 _entityIdThatOpenedIt) [0x00184] in <0266d593c0f442fa83ca9e728741ee90>:0
at (wrapper dynamic-method) GameManager.DMD<GameManager::OpenTileEntityUi>(GameManager,int,TileEntity,string)
at GameManager.TELockServer (System.Int32 _clrIdx, Vector3i _blockPos, System.Int32 _lootEntityId, System.Int32 _entityIdThatOpenedIt, System.String _customUi) [0x00139] in <0266d593c0f442fa83ca9e728741ee90>:0
at BlockSecureLoot.OnBlockActivated (WorldBase _world, System.Int32 _cIdx, Vector3i _blockPos, BlockValue _blockValue, EntityAlive _player) [0x00067] in <0266d593c0f442fa83ca9e728741ee90>:0
at (wrapper dynamic-method) BlockSecureLoot.DMD<BlockSecureLoot::OnBlockActivated>(BlockSecureLoot,string,WorldBase,int,Vector3i,BlockValue,EntityAlive)
at XUiC_Radial.handleBlockCommand (XUiC_Radial _sender, System.Int32 _commandIndex, XUiC_Radial+RadialContextAbs _context) [0x00034] in <0266d593c0f442fa83ca9e728741ee90>:0
at XUiC_Radial.CallContextAction () [0x000b8] in <0266d593c0f442fa83ca9e728741ee90>:0
at XUiC_Radial.SetCommonData (GUI_2.UIUtils+ButtonIcon _controllerButtonForSelect, XUiC_Radial+CommandHandlerDelegate _commandHandlerFunc, XUiC_Radial+RadialContextAbs _context, System.Int32 _preSelectedCommandIndex, System.Boolean _hasSpecialActionPriorToRadialVisibility, XUiC_Radial+RadialStillValidDelegate _radialValidityCallback) [0x000d0] in <0266d593c0f442fa83ca9e728741ee90>:0
at XUiC_Radial.SetCurrentBlockData (WorldBase _world, Vector3i _blockPos, System.Int32 _cIdx, BlockValue _blockValue, EntityAlive _entityFocusing) [0x0009e] in <0266d593c0f442fa83ca9e728741ee90>:0
at (wrapper dynamic-method) PlayerMoveController.DMD<PlayerMoveController::Update>(PlayerMoveController)