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Hi @prodevis
It seems double quote might be issue..
You should disable 5g firewall rules WP Security > Firewall > Enable legacy 5G firewall protection uncheck the checkbox and save.
You can try add below file contents as WP Security > Firewall > Custom rules as .htaccess rules.
https://drive.google.com/file/d/1AyleuWuiA4i9YJWO4HJ5VImOpUCFLk9V/view
I do have commented below two code which is may be issue.
RewriteCond %{QUERY_STRING} (\"|%22).*(<|>|%3) [NC,OR]
RewriteCond %{QUERY_STRING} (\;|'|\"|%22).*(union|select|insert|drop|update|md5|benchmark|or|and|if) [NC,OR]
If still issue let me know.
Regards
Problem solved.
Thank you very much!!!