ok – i was able to eliminate some noise from the error_log, and I can identify this line item that may be related to the issue, which turns out happens on all NEW fields for ALL sites using THIS theme, not another.
the only log that appears on save of the post is this:
[Thu Feb 25 13:47:15 2021] [warn] [client 213.32.4.94] mod_fcgid: stderr: PHP Warning: preg_match() expects parameter 2 to be string, array given in /var/www/vhosts/inovie.fr/httpdocs/wp-includes/class-wp-block-parser.php on line 417, referer: https://labosud.fr/wp-admin/post.php?post=7912&action=edit
[Thu Feb 25 13:47:15 2021] [warn] [client 213.32.4.94] mod_fcgid: stderr: PHP Warning: strlen() expects parameter 1 to be string, array given in /var/www/vhosts/inovie.fr/httpdocs/wp-includes/class-wp-block-parser.php on line 489, referer: https://labosud.fr/wp-admin/post.php?post=7912&action=edit
…which comes from a core file… so not sure what to do with that.
thanks again for your help!
Kaz
