fix pure Rust workspace and live-grid build

crates/metacrate-grid-agent/src/backend.rs

@@ -409,8 +409,13 @@ impl LibremetaverseWorldSnapshotSource {
                 area: Some(parcel.area),
                 category: Some(format!("{:?}", parcel.category)),
             });
-        if let Some(data) = self.client.environment().environment() {
-            // Calling `environment()` reads the manager's last received value.
+        if let Some(data) = self
+            .client
+            .environment()
+            .region_environment()
+            .and_then(|message| message.environment())
+        {
+            // Read the environment data from the manager's last region message.
             let _ = data.day_cycle();
         }
         let mut terrain_height = 0.0;