It is, but by the same token, when an Orthodox hierarch presents himself for the Catholic Communion, he cannot be advised to obey his bishop.
Loosely related to this: when I traveled to my Russian mother's funeral last winter, I asked two of my Latin priests if I could take Orthodox Communion on that occasion. Both replied citing an appropriate canon law affirmatively, since the occasion excluded the possibility of going to a Catholic Church. Of course, they also urged me to ask permission from the Orthodox Father first. As it happened, there was no Communion at the funeral service at all.
“As it happened, there was no Communion at the funeral service at all.”
That’s right. There is no Divine Liturgy attached to the Funeral Liturgy.
Do you have a guess as to what a Russian Orthodox priest would have said in response to your query?