Correct research of predicted entity beginning

The first letter of predicted entity was missing in some cases.

nerval/evaluate.py

@@ -273,7 +273,17 @@ def compute_matches(
                         and j not in visited_predict
                     ):
                         j -= 1
-                    current_compar += prediction[j + 1 : i]
+
+                    if (
+                        "B" in labels_predict[j]
+                        and get_type_label(labels_predict[j]) == tag_ref
+                        and j not in visited_predict
+                    ):
+                        start = j
+                    else:
+                        start = j + 1
+
+                    current_compar += prediction[start:i]
 
                 found_aligned_beginning = True
                 current_compar.append(prediction[i])