Floating character's hair in a dialogue

Platform, device version and operating system:
PC, Windows 10

Screenshot or image:

What you were expecting to happen, and what actually happened:
Wasn’t expecting a floating hair in the 1st dialogue of Obsidian Depths.

How often does this happen? When did it begin happening?
The dialogues are one-time things here, so… It just happened.
Edit: I didn’t start the mission, so I got to see the dialogue again and it showed up again for the 2nd time. And for the 3rd time (after restart). So it’s rather consistent.

Steps to make it happen again
Collected mail and money, went to Underworld, scrolled around, pressed Fire Rift, checked the units description in Portals, unlocked O. Depths, pressed Quest and there it was.