Uknown Error. The browser says is's a CORS Error

Website, Application, Performance Security
1

We started getting an UNKNOWN ERROR when async requests are sent from develop.kitsrm.ru to api-develop.kitsrm.ru
The browser says it’s a CORS ERROR (see files)
And it happens randomly on several frontend pages
I tried with DNS only (no proxy) + in development mode and there is no issue

Screenshot_20210823_082738
Screenshot_20210823_0827381761×857 242 KB

2

As you can see page is the same and there is no issue.

Screenshot_20210823_082819
Screenshot_20210823_0828191920×908 154 KB

3

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