... helms, HELMS in the deep...

[ChaosGodstone]

I finally sorted my .defs out and built a new mod in V2.10.0, 0_o ... that's not right.

So I made a test mod, only leaving out my edits, free building and no fall damage, like the test before. And sure enough, BY DURIN'S SINGED NOSEHAIRS, the build menu is filled with HELMS!!! All of the build menu tabs were missing their rightful icons.

Not really sure if it will help determine the cause of the disappearing icons, but here's the build log.

build_log.txt

[ChaosGodstone]

0_0 ... hmm?
0_o ... HMPH!!

I had hoped for probable user error, or maybe total pebkac ... but no, the DT_Constructions.json has its import table having been built with multiple repetitions of;

        {
            "$type": "UAssetAPI.Import, UAssetAPI",
            "ObjectName": "/Engine/UnknownPackage",
            "OuterIndex": 0,
            "ClassPackage": "/Script/CoreUObject",
            "ClassName": "Package",
            "PackageName": null,
            "bImportOptional": false
        },

Which should read, according to another previous build file;

      {
           "$type": "UAssetAPI.Import, UAssetAPI",
           "ObjectName": "/Game/Tech/Data/StringTables/Interactables",
           "OuterIndex": 0,
           "ClassPackage": "/Script/CoreUObject",
           "ClassName": "Package",
           "PackageName": null,
           "bImportOptional": false
       },
       {
           "$type": "UAssetAPI.Import, UAssetAPI",
           "ObjectName": "/Game/Tech/Data/StringTables/ST_FoundersDay_Event",
           "OuterIndex": 0,
           "ClassPackage": "/Script/CoreUObject",
           "ClassName": "Package",
           "PackageName": null,
           "bImportOptional": false
       },
       {
           "$type": "UAssetAPI.Import, UAssetAPI",
           "ObjectName": "/Game/DLC/BeornPack/Icons/T_UI_BuildIcon_Beorn_Beam_1m_A",
           "OuterIndex": 0,
           "ClassPackage": "/Script/CoreUObject",
           "ClassName": "Package",
           "PackageName": null,
           "bImportOptional": false
       },
       {
           "$type": "UAssetAPI.Import, UAssetAPI",
           "ObjectName": "/Game/DLC/BeornPack/Icons/T_UI_BuildIcon_Beorn_Beam_1m_B",
           "OuterIndex": 0,
           "ClassPackage": "/Script/CoreUObject",
           "ClassName": "Package",
           "PackageName": null,
           "bImportOptional": false
       },

etc.
I wonder if this is a further transgression of the data loss issue you noticed?