Thanks @JasperGeurtz at pointing out this was wrong on frame 0.

Author: bytekeeper

src/main/java/bwapi/Game.java

@@ -262,9 +262,11 @@ void unitHide(final int id) {
     }
 
     void onFrame(final int frame) {
-        allUnits = Collections.unmodifiableList(visibleUnits.stream()
-            .map(i -> units[i])
-            .collect(Collectors.toList()));
+        if (frame > 0) {
+            allUnits = Collections.unmodifiableList(visibleUnits.stream()
+                .map(i -> units[i])
+                .collect(Collectors.toList()));
+        }
         getAllUnits().forEach(u -> u.updatePosition(frame));
     }