Well, that’s relatively annoying. It’s not that I ‘can’t’ do the test, it’s that I don’t want to: it’s a more complex version of one that already gave me quite a bit of trouble, and as I’m in the mid-20s of the mastery ranks anyway - and so the rewards for unlocking new ranks just… aren’t that exciting - it’s just not worth it to me to do all the pattern memorization (or, alternately, to just beat my head against it until I luck out) that would be required to beat it.
In other words: I don’t really care about what I’d get for passing the test, so it’s not worth playing it over and over (either in practice, or just once a day until I luck out) until I beat it. I’ve got better things to do with my life that play parts of Warframe I don’t enjoy; hell, I’ve got better things to do IN Warframe than to play parts of Warframe I don’t enjoy.
I’d just prefer it if the game didn’t continually insist I SHOULD be playing the parts I don’t enjoy - I mean, I’ve never beat the Railjack Void Orphix Node, either, but the game doesn’t insist I try every twenty four hours, or else it’ll continually remind me that I really should be trying.