All the characters I export to UE4 have shadows under there eyes that are not there in CC3 I have the headshot plugin enabled. I am using Unreal version 4.25 and using the cc3 autosetup plugin inside unreal. This happens with custom characters and with even default CC+ Caleb preset with no modifications made.
Attached is Caleb example and another custom char example but it happens with all exports.
I used the settings from the video Reallusion put out.
This is the link to the video.
I narrowed it down to the eyelashes and I even found another post that talked about it with different circumstances.
This is that post: https://forum.reallusion.com/445018/Eyelash-Shadow-In-Unreal?PageIndex=2#bm445155
For them it ended up being the Blend from translucent to masked.
I was able to repeat and clear the shadows up in the game world. But they persisted in the mesh view.
I've attached one pic with all 3 views. It has the blend changed to Masked and has the in game view along with mesh view. Also shows the eyelash mesh that is having the issue.
I'll take a look at the manual procedure you posted but that is suppose to been replaced. I will compare settings to see if I can find a difference. At any rate though, hopefully someone at Reallusion is listening to this thread. I imagine it is happening to more than just me.
Also thank you for taking the time to answer. I appreciate it.