Issue #3491536 by mogtofu33, just_like_good_vibes: Icon as slot or prop

src/Plugin/Derivative/EntityFieldSourceDeriverBase.php

@@ -136,6 +136,7 @@ abstract class EntityFieldSourceDeriverBase extends DeriverBase implements Conta
         "label" => $field_storage_definition->getLabel(),
         "bundles" => array_values($field_info['bundles'] ?? []),
         "metadata" => [
+          "type" => $field_storage_definition->getType(),
           "configurable" => ($field_storage_definition instanceof FieldStorageConfig),
           "editorial" => in_array($field_name, $entityFieldsClassification["fields_editorial"]),
           "parent_base" => in_array($field_name, $entityFieldsClassification["parents_base"]),

src/Plugin/UiPatterns/Source/DerivableContextSourceBase.php

@@ -128,7 +128,19 @@ abstract class DerivableContextSourceBase extends SourcePluginBase {
     }
     $sources = $sources["value"];
 
-    $source_configuration = $this->isSlot() ? array_values($sources["sources"])[0] : $sources;
+    if ($this->isSlot()) {
+      if (isset($sources["sources"])) {
+        $source_configuration = array_values($sources["sources"])[0];
+      }
+    }
+    else {
+      $source_configuration = $sources;
+    }
+
+    if (!isset($source_configuration["source_id"])) {
+      return $this->sourcePlugins;
+    }
+
     foreach ($derived_contexts as $derived_context) {
       $target_plugin_configuration = array_merge($source_configuration["source"] ?? [], [
         "context" => $derived_context,