Cannot move issue if there was a parent/child relation with another non-sub-task issue

Issue Summary

Currently, it is possible to update a Sub-task's issue type via CSV (that has already been reported here).

But, if you then move that modified Sub-task to another project, and then create a new Sub-task under the same issue (the parent), you will not be able to move the current parent issue to another project.

Environment

Jira Cloud.

Steps to Reproduce

• Create two issues: A and B;
• Create a link between A and B (e.g. relates to);
• Convert B to sub-task, selecting A as the parent;
• Change B's issue type to a standard issue type;
• Move B to a different project;
• Create a new sub-task under A;
• Try to move A to another project.

Expected Results

A will be moved to another project successfully.

Actual Results

Jira will not be able to move A, stating an error message: At least one of the issues you are trying to move has been recently updated by another user (<issue key>). Please cancel and start again.

Error message below:

Workaround

Convert A's sub-task to issue, move A, then move that sub-task you've converted to the same project. After moving that sub-task you've converted to the same project where A is now, convert it to sub-task again, selecting A as the parent.