Russia's tanks in Ukraine have a 'jack-in-the-box' design flaw. And the West has known about it since the Gulf war - CNN

…The problem relates to how the tanks' ammunition is stored. Unlike modern Western tanks, Russian ones carry multiple shells within their turrets. 

This makes them highly vulnerable as even an indirect hit can start a chain reaction that explodes their entire ammunition store of up to 40 shells. The resulting shockwave can be enough to blast the tank's turret as high as a two-story building, as can be seen in a recent video on social media…

https://www.cnn.com/2022/04/27/europe/russia-tanks-blown-turrets-intl-hnk-ml/index.html