It seems that, with PS CC 2019, some problems were introduced in the File Info dialog box (at least on Windows systems).
The main problem is that the up/down cursor keys don't seem to work anymore in text fields in File Info. For instance, in the Keywords section of the Basic tab of File Info, if you have many keywords (enough of them so that they span more lines than the field will fit by default), you can scroll up and down through them using the GUI's clickable arrows, but pressing the up/down cursor keys (in the physical keyboard) to move through the lines won't do anything.
The same applies to other multi-line fields in File info when using PS CC 2019.
On top of that, there is at least another problem that could be related - in the Photoshop tab (File Info>Photoshop), the history log for the file is shown (provided it was activated in the preferences). In this case, if the list is long, the clickable arrows don't seem to work at all. This problem is already reported in a separate thread, but I think the explanation was not very clear.
I don't use File Info so it's not really a problem for me, but some people brought this to my attention and after checking File Info both in CC 2018, and then in 2019, I was able to reproduce what I was told (and also, that it used to work ok with the previous version).
I am using Windows 10 and the latest PS CC 2019 update at this moment, 20.0.1.