Ensure that the style templates are added at the end of suggestions

+++ b/paragraphs_collection.module
@@ -18,9 +18,9 @@ function paragraphs_collection_paragraph_access(EntityInterface $entity, $operat
 /**
- * Implements hook_theme_suggestions_HOOK().
+ * Implements hook_theme_suggestions_HOOK_alter().
  */
-function paragraphs_collection_theme_suggestions_paragraph(array $variables) {
+function paragraphs_collection_theme_suggestions_paragraph_alter(array &$suggestions, array $variables) {
   $suggestions = [];

as discussed, you drop the existing suggestions here. you also don't need to return them anymore (as they are altered by reference), but you do want to keep the early return.

+++ b/tests/themes/paragraphs_collection_test_theme_a/templates/paragraphs/paragraph--separator--test-template.html.twig
@@ -0,0 +1,6 @@
+{#
+/**
+ * @file
+ * Theme override for paragraph separator.
+#}
+{% block content %}paragraph-style-template{% endblock %}

replacing the template *only* with your change could be confusing when debugging. I would suggest you instead extend from the default paragraph.html.twig and just *add* a static line, to assert that it is there.

+++ b/src/Tests/ParagraphsStylePluginTest.php
@@ -553,4 +553,45 @@ class ParagraphsStylePluginTest extends ParagraphsExperimentalTestBase {
+    ];
+    $this->drupalPostForm(NULL, $edit, 'Save');
+    // Assert that the text of the templates are displayed.
+    $this->assertUniqueText('paragraph-style-template');
+    $this->assertUniqueText('paragraph-type-template');

Hm. You're not *really* sure that the right paragraph is using the right template with this.

I would do it with a single paragraph that you change. First create it without a style value, save. Make sure it shows the type template.

Then edit, select a style and save again, make sure it uses the other template now.

Thanks, looks good.