Template Registration: WooCommerce templates trigger PHP warning for sites using the FrontPage template

[bacoords]

Description

If you have a 'frontpage' template active and WooCommerce active, visiting the frontpage of your site will trigger the block template loader to search (and fail to find) the custom WooCommerce templates, leading to this notice:

[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "archive-product" in /wordpress/wp-includes/block-template.php on line 236
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "taxonomy-product_attribute" in /wordpress/wp-includes/block-template.php on line 236
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "product-search-results" in /wordpress/wp-includes/block-template.php on line 236
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "page-cart" in /wordpress/wp-includes/block-template.php on line 236
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "page-checkout" in /wordpress/wp-includes/block-template.php on line 236
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "order-confirmation" in /wordpress/wp-includes/block-template.php on line 236
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "single-product" in /wordpress/wp-includes/block-template.php on line 236
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "coming-soon" in /wordpress/wp-includes/block-template.php on line 236
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "archive-product" in /wordpress/wp-content/plugins/gutenberg/lib/compat/wordpress-6.9/template-activate.php on line 311
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "taxonomy-product_attribute" in /wordpress/wp-content/plugins/gutenberg/lib/compat/wordpress-6.9/template-activate.php on line 311
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "product-search-results" in /wordpress/wp-content/plugins/gutenberg/lib/compat/wordpress-6.9/template-activate.php on line 311
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "page-cart" in /wordpress/wp-content/plugins/gutenberg/lib/compat/wordpress-6.9/template-activate.php on line 311
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "page-checkout" in /wordpress/wp-content/plugins/gutenberg/lib/compat/wordpress-6.9/template-activate.php on line 311
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "order-confirmation" in /wordpress/wp-content/plugins/gutenberg/lib/compat/wordpress-6.9/template-activate.php on line 311
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "single-product" in /wordpress/wp-content/plugins/gutenberg/lib/compat/wordpress-6.9/template-activate.php on line 311
[29-Oct-2025 13:54:47 UTC] PHP Warning:  Undefined array key "coming-soon" in /wordpress/wp-content/plugins/gutenberg/lib/compat/wordpress-6.9/template-activate.php on line 311

Step-by-step reproduction instructions

1. Install 6.9beta (or GB 21.9.0)
2. Install WooCommerce
3. Open the site editor and add a FrontPage template
4. Visit the frontpage on your website

Screenshots, screen recording, code snippet

No response

Environment info

• 6.9beta2
• Guteberg 21.9.0 (optional)
• Woo 10.3.3
• Tested with multiple themes, including TT5

Please confirm that you have searched existing issues in the repo.

• Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

• Yes

Please confirm which theme type you used for testing.

• Block
• Classic
• Hybrid (e.g. classic with theme.json)
• Not sure

[bacoords]

CC @ellatrix