(bug report) polynomial ring over large prime

edit

Try:

p= next_prime(1000)  # or some other prime
R.<x,y>= GF(p)[]
pol= 18*x
print(pol/x)

When $p$ is small, this correctly prints 18. However, when p is at least 536870923 (the first prime after $2^{29}$), this prints 18*x/x, the fraction is not simplified.

I'm on sage 10.8 installed this morning.