Exporting Cucumber Features with a "keys" or "filter" in the parameter that is not an XRay issue (Epic, Story), returns a 500 Internal Application Error, when there are Epics from Next Gen projects

Short Description: Exporting Cucumber Features with a "keys" or "filter" in the parameter that is not an XRay issue (Epic, Story), returns a 500 Internal Application Error, when there are Epics from Next Gen projects.

Steps to Reproduce:

Precondition: there are epics from next gen projects in the environment

1 - First make a request of an export cucumber feature with a "keys" or a "filter" that is/returns a Precondition issue

2 - Click to Send the request and verify that API will respond with "error": "No Cucumber Tests were found when exporting"

3 - Now, make a request of an export cucumber feature with a "keys" or a "filter" in the parameters that is not an Xray issue (ex: Story, Epic or Task...)

2 - Click to send the request

Actual Result: A 500 Internal Application Error is returned by the API

Expected Result: It should be possible to export cucumber features via REST API using the coverable issue key.