Hi,
While creating the issue i am trying to link the issue with other issue I am selecting "blocks" and while entering the issue for some issues I am getting the issue in the list below when I am entering the issue key , but some of the issues are not listed can anyone explain on what logic does this work.

If Iam trying to link the same issue in after creating a story then it is showing in the list

can some one explain the behaviour of linking issue while creating an issue.