For Proteus3, there is a bug that causes black spots and afterimage-like artifacts that has not yet been corrected.
The afterimage-like artifacts also occur in Iris1, and are worse than in Proteus3.
I have not seen any reports of black spots in Iris1 so far, but I don’t know if they have been addressed or if they just don’t seem to occur by accident. Because if it can be clearly addressed in Iris1, it should be possible to improve Proteus3, but it has not yet been improved.
