that was a bad idea in hindsight

common/src/main/java/net/lerariemann/infinity/dimensions/RandomDimension.java

···
         Map<String, NbtList> tags = new HashMap<>();
         for (String s : structure_ids.keySet()) for (String ss : dictionary.getKeys()) if (s.contains(ss)) {
             for (NbtElement e : (NbtList) Objects.requireNonNull(dictionary.get(ss))) {
-                String t = String.valueOf(e);
+                String t = e.asString();
                 if (!tags.containsKey(t)) tags.put(t, new NbtList());
                 structure_ids.get(s).forEach(fullname -> tags.get(t).add(NbtString.of(fullname)));
             }