Never noticed that.
However what's the spoiler? I don't get it.
Myrrah being Kait's grandmother, which was already hinted at in Gears 4?
Myrrah being back alive
The previous game and knowing that Kait will be the main character in Gears 5 made it very clear that Myrrah will play a role in the sequel but what makes it so certain that she will actually return just by looking at the cover art?
Maybe Kait wants to know more about her and then they're just following her footsteps and/or the Swarm try to make Kait the new queen.