After migrating project from Server to cloud, parent task and sub-tasks relationship is not working.
Backup for server - After migrating the project to cloud, parent task and sub-tasks relationship is not working, sub-tasks are removed from parent task now they are showing as individual tasks. Native project (on cloud)looks good.
Problem statement:
--> see the following two link types in the cloud site:
1. "Subtasks"
2. "Is a child of"
screenshot1
-->However, after migration to the server, we only see the link: "Is a child of":
screenshot2

I
did raised a atlassian support ticket (PCS-75590)however they might so busy to resolve my issue
(it's been a 3 months they haven't found anything), so i thought let's ask in Atlassian community as we see great talent here, i might find my solution.
Thanks in advance!
Best regards,
Vishal