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I'm going crazy to understand the reason of this strange behavior.
I'm on WP (6.1), in maintenance mode (all plugins disabled). The reference URL is wp-admin/edit.php, with the latest 20 posts listed in the page. I want to modify, through the quick edit, the post author. When I change the author and click modify I receive this answer:
The network panel in the console admin reports a POST call like this:
mysite.com/wp-admin/admin-ajax.php?_fs_blog_admin=true
with this payload:
Tipo MIME: application/x-www-form-urlencoded; charset=UTF-8
post_title: Clima: nuovo blitz attivisti su Gra di Roma. La rabbia degli automobilisti
post_name: clima-nuovo-blitz-attivisti-su-gra-di-roma-la-rabbia-degli-automobilisti
jj: 02
mm: 11
aa: 2022
hh: 15
mn: 08
ss: 29
post_author: 35
post_password
post_category[]: 0
post_category[]: 25326
tax_input[post_tag]
_status: publish
_inline_edit: c291a5712d
post_view: list
screen: edit-post
action: inline-save
post_type: post
post_ID: 331431
edit_date: true
post_status: all
and this querystring param:
_fs_blog_admin: true
The call returns a 200 response code and a 0 written in the preview.
I've seen my server log and I've found just a row:
[03-Nov-2022 10:43:13 UTC] PHP Warning: call_user_func_array() expects parameter 1 to be a valid callback, function 'wp_ajax_inline_save' not found or invalid function name in /home/jxradioc/public_html/wp-includes/class-wp-hook.php on line 308
This is a simple warning, not a block.
Now I'm really confused about this because I cannot understand what could be the starting point of investigation.
If I change the author inside the post edit page, everything is ok.
Last consideration: this is a random error, sometimes (very rarely) works also with the quick edit way but is not systematic.
Thanks in advance for every suggestion.
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