I found the error in debug.log as below:

“blacklist_keys” option key has been renamed to “disallowed_keys”. in //public_html/wp-includes/functions.php on line 5495

I traced it back to bbpress

[1] => Array
(
[file] => /public_html/wp-content/plugins/bbpress/includes/common/functions.php
[line] => 883
[function] => get_option
)

This error happens when I edit topic and save it.

Please help to fix it, thank you!

[@johnjamesjacoby Keymaster 3 years, 1 month ago]

This is a deprecated argument that only appears when WP_DEBUG is turned on.

The debug log itself is nothing to worry about. 👍

bbPress will address this once its minimum version is (legitimately) raised to 5.5.

Thank you for letting us know here 🙏

[@mike80222 Participant 2 years, 1 month ago]

@johnjamesjacoby, any idea when this might be addressed?