I changed the tick rate so that basically nothing spawned on the panels, then cleaned them all to the point where they were entirely clean, and the task still hasn't ended, it might just not be updating properly? idk
Haven't heard of such a problem yet. Are there any errors in the console? If you can -- please reach out to me on Discord and send me your save file where this happens. I would really like to fix this.
I've sent a DM with my save file attatched, and a quick run down of what was happening before the mission started in case thats what bugged it, i hope its helpful! :)