I know we don't know, but take a guess!
I beileve there is an unknown repulsive force as the mass becomes small enough to exibit quantum effects but still occupies a volume of space. This force will arise from the uncertainty principle. From the core of the black hole's
perspective from collapse to explosion is the blink of an eye, while we see an event horizon that lasts for eons due to us not being time dilated in our outsider perspective