I’ve had a somewhat similar issue that I’ll be working on with Boris here tomorrow to get debugged/fixed. My mod loads up on local play and a dedicated server, but all the items I added do not exist or are not being recognized by the game. I say this because I cannot spawn in the items with the itemid’s (and yes the correct ones), nor can I find them where they should be in game.
Please note I DO in fact have PrimalGameData_BP_CUSTOMNAMEHERE setup correctly referencing the items in the master item list, and have the override enabled with the desired PrimalGameData on the GenericMod_Customnamehere map. The items work fine and show up in the Dev Kit as well.