On 1.30 Experimental, every "modded class GameConstants" fails the Game script module with

Circle inheritance in class 'GameConstants'

The same modded-class pattern on another constants-only vanilla class (PlayerConstants) compiles.

possible cause
Vanilla scripts/3_Game/constants.c, line 856 (inside class GameConstants):

static const float ITEM_TEMPERATURE_NEUTRAL_ZONE_MIDDLE = (GameConstants.ITEM_TEMPERATURE_NEUTRAL_ZONE_UPPER_LIMIT + GameConstants.ITEM_TEMPERATURE_NEUTRAL_ZONE_LOWER_LIMIT) * 0.5;

The initialiser refers to the class by its own qualified name

1. Start the 1.30 Experimental server (DayZDiag_x64.exe or DayZServer_x64.exe) with

-mod=<path>\@GameConstantsRepro (both addons; the failing one aborts the Game module)

To run the two cases separately, put each PBO alone in its own mod folder. On the EOC drive:

P:\@GameConstantsRepro_Fail\Addons\GCRepro_Fail.pbo -> P:\EOC_Test_GCRepro_Fail.bat

P:\@GameConstantsRepro_Control\Addons\GCRepro_Control.pbo -> P:\EOC_Test_GCRepro_Control.bat

2. Read the newest script_*.log in the profiles folder.

EXPECTED (1.29 behaviour)

Module: Game; loaded ... Module: World; loaded ... Module: Mission; loaded ...