In Team Managed Project moving the Tasks and its subtasks to Epic in another project causes error 500 and corrupted data

Problem

In Next Gen moving the Tasks and its subtasks to Epic in another project causes error 500 and corrupted data

Environment

Next Gen

Steps to Reproduce

Create a Task with a few Subtask in Project A
Move the ticket to the project B by
Mapping Task ----> Epic
Mapping Subtask -----> Subtask
Follow the prompts
Confirm
Refresh
Acknowledge
Error 500 please see the attache screenshots
The subtasks are not showing in the Epic but there is a broken link between the Epic and subtasks
Deleting the Epic will delete all the subtasks also.

Expected Results

Either give a warning this mapping is not supported or keep the hierarchy as it is expected

Actual Results

Corrupted data

Workaround

To clone the Epic as a Task and move the subtasks to the Task