Index: entity_browser/modules/entity_form/entity_browser_entity_form.module
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- entity_browser/modules/entity_form/entity_browser_entity_form.module	(revision )
+++ entity_browser/modules/entity_form/entity_browser_entity_form.module	(revision )
@@ -38,6 +38,11 @@
     return;
   }
 
+  $cardinality = -1;
+  if($instance->getFieldStorageDefinition()->get('cardinality') !== $cardinality) {
+    $cardinality = $instance->getFieldStorageDefinition()->get('cardinality') - $count_existing_selection;
+  }
+
   // Fetch the number of currently selected entities, if any.
   $count_existing_selection = count($form_state->get([
     'inline_entity_form',
@@ -49,7 +54,7 @@
   $reference_form['entity_browser'] = [
     '#type' => 'entity_browser',
     '#entity_browser' => $entity_browser_id,
-    '#cardinality' => $instance->getFieldStorageDefinition()->get('cardinality') - $count_existing_selection,
+    '#cardinality' => $cardinality,
   ];
   $reference_form['#attached']['library'][] = 'entity_browser_entity_form/ief_autocomplete';
   $reference_form['actions']['ief_reference_save']['#ajax']['event'] = 'entities-selected';