When I served with clergy in a Romanian Orthodox church on Bright Tuesday, I had a surprise. Not only was the curtain closed at certain points during the liturgy, but the clergy knelt for the anaphora. I have never encountered this with Serbs, Ukrainians, Russians, or anyone else.
Do any Byzantine Catholics practice kneeling during Bright Week? I wonder if this is a Romanian thing. Like the Serbs, Romanian practice tends to be halfway between Russian and Greek practice. Also like the Serbs, Romanians seem to do things that nobody else does. Of course, this is the only Romanian parish that I have ever served in. What do Romanian Greek Catholics do during Bright Week?