Conventional Start. Two tech teams running, one was researching Trans-Newtonian. Looking at Research Tab of Economics screen, hit 30 days. Event log says Trans-Newtonian Tech completes. The scientist responsible for it did not reappear in the Scientist list box until I had switched to a different technology type in the dropdown.
EDIT: Also worth noting... when I switched back to the Industry tab, the Installations ListBox did not populate until I reselected "Installations" in the dropdown.
EDIT 2: Having completed later research projects, I feel I can safely say at this stage that, when a scientist finishes a project and does not have another, the scientist listbox needs to be refreshed before they will reappear in it.
EDIT 3: Interestingly, I had a case where the event view told me a scientist not currently assigned a research project had an Administrative Rating bump. I went to look for him in my Scientist Listbox, and did not see him. I haven't made any teams at this point, so I thought, "oh, another example of this bug", so I hit "Refresh All"... and it didn't refresh the listbox. The only way I could get that list to refresh was to click on the Technology Category Dropdown.
EDIT 4: This is not simply related to scientists finishing projects... new scientists that join my scientific establishment also do not appear in the list box until I fiddle with the dropdown.