Timeouts while publishing/updating posts

In 3.8.8 version there is problem with Error 524 while publishing or updating posts. In older version (3.8.7) everything is working fine. I tested this on two different websites and resultats are the same.

[Cloudflare] ERROR: [CLIENT API] Array
(
    [type] => request
    [path] => https://api.cloudflare.com/client/v4/zones/xxx/purge_cache
    [timeout] => 30
    [method] => DELETE
[...]
)
[Cloudflare] ERROR: [CLIENT API] Array
(
    [type] => response
    [reason] => Internal Server Error
    [code] => 500
)
 
[Cloudflare] ERROR: Internal Server Error