[shrivastavanolo]

Trac ticket: https://core.trac.wordpress.org/ticket/63693

Summary

wp_should_load_separate_core_block_assets() and wp_should_load_block_assets_on_demand() run early (init, wp_default_styles), before the main query exists, so their is_feed() check can't return a meaningful result.

This adds a private helper, _wp_is_non_frontend_request_for_block_assets(), used by both functions. It checks is_admin() and wp_is_rest_endpoint() as before, and only calls is_feed() once the wp action has fired.

REST requests still can't be detected at init, since REST_REQUEST isn't defined until parse_request. Fixing that would mean moving block registration later, which could break code that expects it on init.

Use of AI Tools

AI assistance: Yes
Tool(s): Clade code
Model(s): Sonnet 5.5
Used for: Initial code skeleton and test suggestions; final implementation and tests were reviewed and edited by me.

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This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.

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