Correct function_exists() check typo introduced in #33331.

[desrosj]

Description

This corrects a function_exists() check introduced in #33331.

Checklist:

• My code is tested.
• My code follows the WordPress code style.
• My code follows the accessibility standards.
• I've tested my changes with keyboard and screen readers.
• My code has proper inline documentation.
• I've included developer documentation if appropriate.
• I've updated all React Native files affected by any refactorings/renamings in this PR (please manually search all *.native.js files for terms that need renaming or removal).

[mcsf]

Thanks, that was fast!

While we're here, could you test something on your end? Try to render a post that contains a "legacy" Query Loop block — that is, one serialised as wp:query-loop instead of wp:post-template? I ran into a fatal when the gutenberg_render_legacy_query_loop_block compat function tried to call an undefined render_block_core_post_template. I'd like to make sure this is just a consequence of my weird setup (as I'm in the middle of debugging something else). This is on WP 5.7.2, btw.

[ntsekouras]

Thanks for the fix!

I ran into a fatal when the gutenberg_render_legacy_query_loop_block compat function tried to call an undefined render_block_core_post_template.

That's true. Should we call gutenberg_render_block_core_post_template instead of render_block_core_post_template? Since we have moved this function outside of post-template/index.php the built file has appended gutenberg_ prefix, no?

[gziolo]

Should we call gutenberg_render_block_core_post_template instead render_block_core_post_template? Since we have moved this function outside of post-template/index.php the built file has appended gutenberg_ prefix, no?

It seems like a good call since it's in the scope of the Gutenberg plugin so we might want to use the latest version of the render callback from Post Template block.

[mcsf]

Sounds good. 🚢