[wp-trac] [WordPress Trac] #55996: the get_the_block_template_html call all the same functions as the the_conent filter so they are run twice

[WordPress Trac]

#55996: the get_the_block_template_html call all the same functions as the
the_conent filter so they are run twice
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 Reporter:  pbearne                       |       Owner:  (none)
     Type:  defect (bug)                  |      Status:  new
 Priority:  normal                        |   Milestone:  Awaiting Review
Component:  Formatting                    |     Version:
 Severity:  normal                        |  Resolution:
 Keywords:  needs-patch needs-unit-tests  |     Focuses:  performance
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Comment (by ocean90):

 I'm trying to debug why the lazy loading attribute isn't omitted for the
 first image (feature from #53675) in a block theme using template parts
 and als noticed the direct call to `wp_filter_content_tags()` in
 `get_the_block_template_html()` but also
 `render_block_core_template_part()`.

 It seems like `false` gets passed to `wp_get_loading_attr_default()` in
 these cases which is actually an undocumented value but happens when the
 function is not used as part of a filter thus `current_filter()` returns
 false.

 Removing both `wp_filter_content_tags()` calls still adds the loading
 attribute so there's indeed something that still runs the `the_content`
 filter on the output.

 cc: @flixos90 for awareness

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Ticket URL: <https://core.trac.wordpress.org/ticket/55996#comment:5>
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