Fix mesh instance disappear when shadow caster

dist/preview release/what's new.md

@@ -204,6 +204,7 @@
 - Fixed `Sound` not accepting a `TransformNode` as a source for spatial sound ([Poolminer](https://github.com/Poolminer))
 - Fixed an issue with transformation set after physics body was created using cannon.js ([#7928](https://github.com/BabylonJS/Babylon.js/issues/7928)) ([RaananW](https://github.com/RaananW))
 - Fix bug when using `ShadowOnlyMaterial` with Cascaded Shadow Map and `autoCalcDepthBounds` is `true` ([Popov72](https://github.com/Popov72))
+- Fix bug when using shadows + instances + transparent meshes + `transparencyShadow = false` ([Popov72](https://github.com/Popov72))
 
 ## Breaking changes
 

src/Lights/Shadows/shadowGenerator.ts

@@ -1030,6 +1030,10 @@ export class ShadowGenerator implements IShadowGenerator {
             for (index = 0; index < transparentSubMeshes.length; index++) {
                 this._renderSubMeshForShadowMap(transparentSubMeshes.data[index], true);
             }
+        } else {
+            for (index = 0; index < transparentSubMeshes.length; index++) {
+                transparentSubMeshes.data[index].getEffectiveMesh()._internalAbstractMeshDataInfo._isActiveIntermediate = false;
+            }
         }
     }