This for a site running 6.5.36. I’m not sure when site upgraded to 6.5.36 but I can see that problem persists. Log is still full of:
2025/03/10 15:24:40 [error] 89646#89646: *3422010 FastCGI sent in stderr: “PHP message: PHP Warning: Undefined array key “too-many-chars-for-custom-field” in /www/thehorsecom_382/public/wp-content/plugins/yop-poll/public/public.php on line 192;