10

Reported to WRI CASE: 4278450
Comparing the following, all done from clean kernel
The strange thing is that V 12 can solve this same PDE without the assumptions
k = 1/10; A = 60;
pde = D[u[x, t], t] == k*D[u[x, t], {x, 2}];
bc = u[0, t] == A;
ic = u[x, 0] == 0;
sol = DSolve...