What are chances a BJT switch is damaged if a capacitor discharges to ground
No and no.

68 pF is such a low value that even at 25V the energy stored is just about 21 nJ. Charge stored is 1.7 nC. For this charge to produce a > 15A current peak, it will need to go trough the BJT in just &lt; 113 ps, which is ridiculously fast considering its transition frequency is 2.5 MHz and that the capacitor will have some ESR. Also, such a current pulse, if it could happen a all, would be well within the device SOA.

Summarising: it's perfectly fine, don't worry.