The update (4 may 2015) killed this bug.
Previous save files for the above mentioned scenario are loading without problems
Thanks a lot, developers!!

Sadly buildings of a size of 5x5 are not possible to build yet due to overflow of something. Try to build 4x5 maximum. Also using large tiles(2x2) instead of 4 single tiles may be helpful.
Those 5x5 means putting 5 base platforms on the ground.

Restarted S1 prototype Lyot
Stand up from the ground, saved immediately and tried to reload this savegame.
Rover circled-freezed-circled again,
Press any key message appeared and.. crash :(

Log E:\Steam\userdata\0815\244030\local\crash.log started at 23.04. 20:07:01

SomeFunnyName, 23.04 2015 20:07:01
Entity is already deleted
Class: 'OxyTankController'
Function: 'Update3DGUI'
Stack trace:
Scripts/Entities/Controllers/TakeMeToMars/InventoryItems/Items/OxyTank.h:202
Scripts/Entities/Controllers/TakeMeToMars/InventoryItems/Items/OxyTank.h:287
scripts/Campaign/GameObjectsImpl.h:7713
scripts/Entities/Object_InventoryItem.h:400
scripts/CCGame.c:702

Runtime mode

------------------------------------

SomeFunnyName, 23.04 2015 20:07:08
Unhandled exception

Program: E:\Steam\steamapps\common\Take On Mars\TKOM.exe
Reason: Access violation. Illegal read by 102be604 at 0
Script callstack:
Class: 'Vehicle_Handler'
Entity name:''

Function: 'RadialMenuSetAction'
Stack trace:
scripts/Entities/VehicleHandler.h:618
scripts/Entities/VehicleHandler.h:701
scripts/Entities/VehicleHandler.h:1118
scripts/Entities/VehicleHandlerFuncs.h:1008
Scripts/Entities/Controllers/TakeMeToMars/InventoryItems/Items/OxyTank.h:202
Scripts/Entities/Controllers/TakeMeToMars/InventoryItems/Items/OxyTank.h:287
scripts/Campaign/GameObjectsImpl.h:7713
scripts/Entities/Object_InventoryItem.h:400
scripts/CCGame.c:702

[enf::BaseWorld::AddThread]: ??? addr:0x102be604
[enf::BaseWorld::AddThread]: ??? addr:0x102be604

(Press Retry to debug the application - JIT must be enabled)

Runtime mode

Yes but as far as i understand the code it does not divide between mars soil or moon soil.
If (on mars) I add those barrel filled with mars soil to the hydroponic the soil is rising inside the hydroponic.
On the moon I did the same (with moon soil) and nothing happened.