Mod's GAME.CON won't load if mod started from command line with -j parameter

• Put EDuke32 into a separate directory
• Download this mod as an example https://github.com/fgsfds/Liquidator-3D/releases/tag/1.4 and put it in another directory
• Start game with the following command .\eduke32.exe -g "path\to\liquidator.zip" -j "path\to\duke3d\install"

Expected: GAME.CON from liquidator.zip is loaded, custom campaigns present in the main menu

Actual: original Duke's GAME.CON is loaded, new sounds/textures from liquidator.zip are used, but the campaigns are from Duke

If you start the game with .\eduke32.exe -g "path\to\liquidator.zip" it works fine