In Drupal 11, template_preprocess_item_list() is deprecated and automatically called via the theme registry's 'initial preprocess' system. The manual call in responsive_preview_preprocess_item_list__responsive_preview() causes items to be processed twice, converting attributes to an Attribute object. When Element::children() runs again, it fails with: "attributes" is an invalid render array key. Value should be an array but got a object.

This breaks the entire page rendering for authenticated users, causing empty tags and missing CSS/JS.

Fix: Remove/comment out the manual template_preprocess_item_list($variables) call at line 56.

Issue fork responsive_preview-3568230

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hamzadwaya created an issue. See original summary.

hamzadwaya opened merge request !36

volkerk’s picture

volkerk commented
Status: Active » Closed (duplicate)

See #3543777: InvalidArgumentException: "attributes" is an invalid render array key with 11.x-dev.

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