If these Icons portray a continuation from the ancient copies, Judas wasn't present to partake of the Eucharist. He is seen walking out as Christ blesses the Bread and Wine.
Note: Judas is in the far left in the third Icon.
I don't think it necessarily contradicts the story that Judas partook of the Eucharist. Icons give us a theological/symbolic concept of a story, not necessarily something in its exact storyline. We crown the Theotokos sometimes as a queen on a throne with her son, the baby Christ, also crowned, and giving the blessing. Can we say that this occurred literally, or does this convey to us a theological teaching?
Judas leaving with the money bag, has darker colors attributed to him, losing the light of Christ, and is depicted on the left side, leaving or looking away from the Eucharist, "to the West" so to speak, as someone who is on the condemned side and forgotten. Whereas all others who partook of the Eucharist are filled with light, with eyes of prayer and contemplation, with holiness and worthiness, whereas the one person who partook of the Eucharist partook of his own condemnation, hence his dark complexion and left-sidedness.
You have a valid point, but why would Christ have an "open-Communion" if tradition tells us that Communion is only for repentant believers? If a priest is supposed to guard the Chalice, why wouldn't Christ do the same?
We do not know Christ's motives. The priest is not literally Christ. Christ is giving His own body and blood and He has His reasons, whereas a priest has the responsibility of guarding the Eucharist since he ministers Christ and not himself. One can ask the same question that if a heretic approached the Eucharist and the priest does not know, why did not Christ tell the priest or shun the heretic or make the heretic sick or something? Should the priest have power to avoid the Eucharist to every person that approaches that he doesn't know just in case? What if the heretic lied?
If Judas did not partake of the Eucharist, one then can consider the lesson of guarding the Eucharist from the unrepentant. If Judas did partake of the Eucharist, one can consider a lesson that Christ does not force you away, but it is Judas who has partook of the Eucharist as a form of condemnation to himself, as a form of unworthy partaking. Both lessons are valid.