I do not think there is a bug, in comparison to Xiii, C2 is slow, really slow. Jolla has advertised it as a reference device, i am almost certain they will not order another batch fron the manufacturer. In a year’s time, once sfos v5.x is stable the next model of s19 pro max whatever will be used as the new model eg C3.
Ps all the above is my wild guess, i might be wrong on that, not on C2 tho.