I was having that issue as well with my Fed engineer character even before today's update. I also still have the issue with assignments at -100 hours that cannot be aborted with my KDF characters, which happened after the new assignment UI. The new UI also constantly glitches out by showing the wrong people and wrong…
I have two characters with "Respond to Subordinate's Challenge" assignment stuck on "Finishing" going on three days now. That pretty much always ends with the doff in sickbay, though of course they have long since completed recovery. Seems like a related bug to me.