Maybe you already found the workaround, but though I will share what I found. The workaround is to setup swimlanes as the WIP applies to the swimlanes. The lanes should be setup using Assignee. I have not yet tested this myself, as i just found the solution but hope it helps you.
I just tested this myself. The workaround i suggested myself doesn't seem to work unfortunately. I set the limit to 1 for a column, move one issue assigned to me and then one issues assigned to someone else and that still gives a red frame, which I hope it wouldn't.
The workaround i picked upp from here: https://jira.atlassian.com/browse/JRASERVER-36973
Anyone who has any other idea how to solve this?
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