Steps:
xb/node/1/editorAssertionError: assert($items->count() === 1) in assert() (line 27 of modules/contrib/experience_builder/src/Plugin/Field/FieldFormatter/NaiveComponentTreeFormatter.php).
per @larowlan in Slack https://drupal.slack.com/archives/C072JMEPUS1/p1738270791767019?thread_t...
that sounds like a bug in the formatter, can you open a separate issue for that one
He also posted code (which I didn't test)
`diff --git a/src/Plugin/Field/FieldFormatter/NaiveComponentTreeFormatter.php b/src/Plugin/Field/FieldFormatter/NaiveComponentTreeFormatter.php
index 7b7a4751..9bd65c50 100644
--- a/src/Plugin/Field/FieldFormatter/NaiveComponentTreeFormatter.php
+++ b/src/Plugin/Field/FieldFormatter/NaiveComponentTreeFormatter.php
@@ -24,6 +24,9 @@ class NaiveComponentTreeFormatter extends FormatterBase {
* {@inheritdoc}
*/
public function viewElements(FieldItemListInterface $items, $langcode) {
+ if ($items->isEmpty()) {
+ return [];
+ }
assert($items->count() === 1);
assert($items[0] instanceof ComponentTreeItem);
// This field type is single-cardinality: delta 0 is rendered.Active
0.0
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