4 posts tagged with "Block Theme"

Encountered these six issues repeatedly while developing WordPress Block Themes for clients. Each one took significant debugging time. This guide covers the root causes and provides ready-to-use solutions.

TL;DR​

Six issues ranked by frequency: file changes not applying (database cache overrides files), block nesting errors (unclosed comments), child theme content not rendering (missing post-content block), SVG icons disappearing (WP_Filesystem polluted by plugins), WP-CLI mail failures (SMTP plugins don't hook in CLI), and gallery images not loading (lazy loading conflicts with the slider). Each scenario includes copy-paste diagnostic commands.

Ran into these four WooCommerce-specific issues while building Block Themes for clients. Each relates to how FSE architecture interacts with WooCommerce's block system. Documenting the troubleshooting process to help others working on WooCommerce theme development.

TL;DR​

Four common issues in WooCommerce Block Theme development: block rename causing core/missing (block names gained -block suffix after upgrade), product archive 404 after shop slug change (rewrite cache not flushed), template HTML mismatch with Gutenberg save (dynamic block validation failure), and Cart/Checkout templates not auto-assigning (manual assignment required). Each scenario includes copy-paste fixes.

Encountered these two issues while developing a WooCommerce FSE Block Theme for a client: Cart Block renders a blank page when empty, and product cards collapse when no featured image is set. Here's the root cause and solution.

TL;DR​

1. Cart Block requires explicit filled-cart-block and empty-cart-block inner blocks -- without them, empty cart renders nothing.
2. FSE's post-featured-image block renders an empty string when no thumbnail exists, causing card height collapse. Fix with post_thumbnail_html filter to inject WooCommerce placeholder.

TL;DR​

In WordPress FSE themes, if a JSON attribute in a Pattern/Template HTML comment has a missing closing quote ", the brace count remains balanced, but parse_blocks() silently sets the block's attrs to null. Gutenberg's save function then produces no inline styles, triggering Block validation failed. Validate JSON with json.loads() to catch this.