[Lava]

Dunno, it depends if the mod replaces specific .are file (if the new container does not appear at all) or script (if the container appears, but it's empty).
If you want to make sure all SotSC are applied, it's best to install the mod after other mods that may replace/change original areas significantly. But if that's the first problem you've encountered, I wouldn't worry too much about it Remember it's an old game and sometimes bugs just happen