We have a project Firmware with workboard columns Backlog and Unscheduled. It also has various subprojects, including 11.9.0.
While running week 14 stable, we used the Firmware workboard to drag and drop a number of tasks from the 11.9.0 subproject into the Firmware > Unscheduled column. Things appeared to work correctly.
A couple days ago we upgraded to week 28 stable, and now in the Firmware workboard, tasks are appearing in both the Unscheduled and 11.9.0 columns. The tasks do not appear on the 11.9.0 workboard, and are not found in a maniphest query for 11.9.0. Looking at the task itself, it's tagged as Firmware (unscheduled) (11.9.0) as if it was in both columns, but editing the task details shows it as tagged only in the Firmware project, not the 11.9.0 subproject.
Looking at the task, I see the expected <user> edited projects, added Firmware; removed Firmware (11.9.0) for when it was originally moved. In the Firmware workboard, dragging the task from 11.9.0 to Unscheduled seems to clean it all up, and the task once again appears to be in a consistent state. It does not create a new <user> edited projects... transaction.
So while I'm able to clean things up and move forward, I only noticed this instance because of the fair number of tasks involved. I'm worried other smaller groups of tasks may be in this state and are going unnoticed. I would appreciate guidance on how to clean this up across our entire install.
This may be a dup of T10638, but thought it was worth a new task to describe our slightly different symptoms.