It's related only to usage REST API
So, it's impossible to change 'status' field, need to use transitions and it works well. But after the change issuetype transitions list is empty because now the ticket status is related to the previous issuetype.
How can I now change the status? Or can I somehow change issuetype and status in one request?
I think your issue types are configured to use different workflows.
Your REST call is failing to transition the issue after the issue type change because it's trying to use a transition that isn't in the workflow the issue is now using. You'll need to read the workflow it is using to find out which transition it should be trying to trigger.
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