I have reported this for previous versions, but I wanted to make sure you were aware that this is still an issue under 1.60.417998.
In the lower left-hand corner of the planet management screen information about your citizens appears. As shown in the first screen snapshot below, sometimes one or more citizens are invisible. The text shows that I have 2 citizens, but only one appears visible.
If you hover over the visible citizen you can see the properties of that citizen, as shown in the second screen snapshot below. If you move your cursor to the right of the visible citizen, a popup will appear as shown in the third screen snapshot below, proving that I do, in fact, have 2 citizens.
The issue is that, sometimes, images for citizens do not appear. Here is a link to a save file that will let you see this:
https://www.dropbox.com/scl/fi/rn30ocnl35jt4monb1c2d/Missing-Citizens-Under-1.60.417998.GC4Sav?dl=0&rlkey=hkdtmpdrx3a99mup0gb79li4a
To see this issue, after you load the save file, go to Sika I. That is the planet I used for the screen snapshots below.


