do not emplace_back to our mLandTextures; instead use the heavy handed resize to be explicit about what we intend to do; resolves issue found here: https://github.com/OpenMW/openmw/pull/3220#issuecomment-964650167

apps/openmw/mwworld/esmstore.cpp

@@ -153,7 +153,7 @@ void ESMStore::load(ESM::ESMReader &esm, Loading::Listener* listener)
     // Land texture loading needs to use a separate internal store for each plugin.
     // We set the number of plugins here so we can properly verify if valid plugin
     // indices are being passed to the LandTexture Store retrieval methods.
-    mLandTextures.addPlugin();
+    mLandTextures.resize(esm.getIndex()+1);
 
     // Loop through all records
     while(esm.hasMoreRecs())

apps/openmw/mwworld/store.hpp

@@ -222,8 +222,7 @@ namespace MWWorld
         const ESM::LandTexture *search(size_t index, size_t plugin) const;
         const ESM::LandTexture *find(size_t index, size_t plugin) const;
 
-        /// Resize the internal store to hold another plugin.
-        void addPlugin() { mStatic.emplace_back(); }
+        void resize(size_t num) { mStatic.resize(num); }
 
         size_t getSize() const override;
         size_t getSize(size_t plugin) const;