The search filters are broken.

[keesiemeijer]

All filters are used for every search, even if you try to filter by a single filter.

See the results for ​https://developer.wordpress.org/?s=get+terms&post_type[]=wp-parser-hook

It should only display posts from the post type wp-parser-hook (hooks). Instead, all filters are checked and it displays posts from all post types.

[keesiemeijer]

If no post types are set use parsed post types

[coffee2code]

In 3276:

developer.wordpress.org: Fix to honor code reference post type search filters.

Props keesiemeijer.
Fixes #1733.