Big detonation of Russian T-90 in Ukraine

Hitting and piercing the armor of T-64/72/80/90 series tanks and derivatives frequently results in a burst of ammunition for the main armament, ending in the turret breaking. There is even talk of the “flying tower syndrome” of Russian carts. However, the Ukrainian 93rd Mechanized Brigade destroyed the T-90, whose detonation was much larger than typical ones. Why?