WordPress Update: function not found or invalid

Just a quick thought – what about themes? Have you tried a default theme?

I haven’t checked the theme yet. I’ll do that later tonight.
In the meantime, two other threads with the same issue have popped up:

https://www.ads-software.com/support/topic/error-after-5-9-update-_disable_block_editor_for_navigation_post_type/

https://www.ads-software.com/support/topic/_disable_block_editor_for_navigation_post_type/

Same problem here.

I found 2 plug-in conflicts:
1. Tutor LMS (they are working on a fix)
2. wp_all_import

Yup, same here.
Has anyone found a solution yet?

I have the same problem!
But now I can’t access my dashboard it shows this

Warning: call_user_func_array() expects parameter 1 to be a valid callback, function '_disable_block_editor_for_navigation_post_type' not found or invalid function name in /homepages/10/d832147324/htdocs/ampusodontologico/wp-includes/class-wp-hook.php on line 307

Warning: Cannot modify header information - headers already sent by (output started at /homepages/10/d832147324/htdocs/ampusodontologico/wp-includes/class-wp-hook.php:307) in /homepages/10/d832147324/htdocs/ampusodontologico/wp-includes/pluggable.php on line 1355

Warning: Cannot modify header information - headers already sent by (output started at /homepages/10/d832147324/htdocs/ampusodontologico/wp-includes/class-wp-hook.php:307) in /homepages/10/d832147324/htdocs/ampusodontologico/wp-includes/pluggable.php on line 1358

Help me please!!