Summary:

Some instances are facing intermittent errors to perform bulk operations, if these are involving sub-tasks. We are already investigating the root cause. When it does happen, a generical error 500 screen is shown.

How to reproduce

Not always reproducible

Perform a bulk operation containing sub-tasks

Expected result:

The operations to be performed

Actual result:

The operations are not performed and the following screen is shown:

Workaround
None at the moment

If you think that you may be affected by this bug, please, contact Atlassian support so we can check if it matches the case or if it is something else.