Jira Rest API can't edit ACE app issue fields


So, about 10 days ago, I’ve ran into a problem with the Jira’s rest api and have already posted about this problem here once -

The problem above seemed to be fixed after a few days of waiting. But just recently it reappeared again.

Am I the one doing something wrong, or is something wrong with the Jira’s api? I didn’t change anything in my code.

Thanks in advance.