Issue #3224491: Unlimited autocomplete suggestion list size always results with empty list

src/EntityAutocompleteMatcher.php

@@ -91,7 +91,9 @@ class EntityAutocompleteMatcher {
           ];
         }
       }
-      $matches = array_slice($matches, 0, $match_limit, TRUE);
+      if ($match_limit >= 1) {
+        $matches = array_slice($matches, 0, $match_limit, TRUE);
+      }
 
       $this->moduleHandler->alter('select2_autocomplete_matches', $matches, $options);
     }