Also having this issue. I feel like it worked when I first downloaded the mod, however now it's not working properly.

EDIT: After some investigating my eggs ARE showing up if they are not sitting on a structure. An egg dropped directly onto the map seems to show up no problem, but if they fall onto a foundation / ceiling they do not display the stats. Not sure what is causing it, but that's what I found.

Have been also having this problem but never tested having the egg on the terrain instead of a foundation, and sure enough, that allows the egg UI to display.

So thought maybe it had something to do with the structure info setting. In the gameusersettings.ini, i've had the setting "DisableStructureInfo" set to false and just un-checked in the in-game settings menu. So i tried setting it to true, then made sure to delete the "SSP_Settings.sav" file so that a new one is populated using the gameusersettings.ini settings.

Doing so, I have come across another problem, setting DisableStructureInfo to true doesn't prevent you from ticking the in-game structureinfo setting. Ticking the box in the in-game settings menu allows structure info to be displayed, even though it shouldn't when having the .ini setting set to true.

Idk if that has anything to do with the issue of the fertilized egg UI from being displayed while on a structure but was my only idea.