The last weak version was 0.24.3 (9 months ago, current 0.28.5), it could be bypassed just using A-Bypass or Fly JB X. A bit of history, developers in 0.26.0, which was released 6 months ago, made the current anticheat system. Few versions before, however, they tried fighting cheat developers using different techniques (encrypting metadata; using frameworks that crash the game if jailbreak is detected). After 0.21.0, they made a detection for fake versions (when you change the info.plist version of the game). I think they just hired a new anti-cheat team at 0.25.0, because throughout those 3 years of iOS cheating I never saw anything like that.
Below is the article of one of the cheat devs in the game. Notice, that article was written when it was 0.25.2, so some information might be outdated (such as the presense of the framework which caused the crash of an application when jailbreak was detected (it got deleted in 0.26.0))
It's mainly the whole info he provided about the anticheat. I translated the whole text from Russian and tried to optimize it, but a lot of russian slang words were used and I might missed something, tell me if you didn't understand something.