There seems to be a MC masters and cels in separate groups control bug.
Group 1 contains the masters of a MC fixture, Group 2 contains the cels only.
Group 1 FULL Enter
sets the masters to full,
Group 2 FULL Enter
sets the cels to full. This is expected behavuiour.
Group 1 + Group 2 FULL Enter
sets only the masters to full and leaves the cels at zero. Expected behaviour would be for the masters and the cels to go to full.
I've seen this in a GLP Impression FR10 Bar Multipixel Normal MC, Eos version 3.2.8 Build 25, Fixture library 3.2.8.1 (although I've made a correction to the zoom in the cel part of the fixture)