Audtilog not works with nginx default-backend

[Norsu296]

Hello, I'm using ingress-nginx on kubernetes and I have enabled Modsecurity via configmap option. Modsecurity works, auditlog is formatted in JSON.
When I set in nginx configmap custom-http-errors auditlog is not sent as JSON but as normal nginx output as described in this link. kubernetes/ingress-nginx#5679 (comment)
How can I fix it? I want to have custom error pages and I want to keep auditlog. I tried everything from issue above and related another issues I think it maybe related with #255 but as I can see it was fixed but it still doesn't work. Im using ingress-nginx chart 4.7.1