Query Loop: "Per_page" value is being appended to "offset" on the backend fetch call

[bacoords]

Description

When using a query loop block on a vanilla WP with Gutenberg plugin activated (on v17.1.3), the query loop often returns empty. If you dig into the REST API calls in your browser, you can see that the offset value is actually being passed the per_page + offset, so instead of offset=0&per_page=12, you end up with offset=120&per_page=12

Step-by-step reproduction instructions

1. Launch a new WP install
2. Install Gutenberg v17.1.3
3. Add the query loop or modify the main page template (you'll need to disable the 'inherit query from template' setting)
4. Mess with any of the pagination settings, per page, offset, etc. Then watch the network tab for the /posts/ endpoint.

Screenshots, screen recording, code snippet

Environment info

• WP 6.4.1
• Gutenberg 17.1.3
• Any theme (I used TT4)
• Tested in PHP 8.0 and 8.1

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

[t-hamano]

Thanks for the report.

I think this issue was resolved in #56439. This fix will ship as part of version 17.2 of the Gutenberg plugin. I'll close this issue, but if this problem still occurs with Gutenberg plugin version 17.2, I'd appreciate it if you could comment again.