Are there any benefits to intermittent fasting when on a bulk (i.e. in a caloric surplus)?
Depends on the individual. Hard gainers should obviously not intermittent fast while trying to gain weight - it will only make it more difficult.
However for most people I would say a 14 ish hour fast would still provide plenty of benefits (insulin sensitivity, even energy levels, cellular benefits etc). Personally I dont see the point in being in any more than a 10% surplus, which is not that difficult to eat for the regular individual, so fasting should not have any drawbacks really - unless you happen to be a hard gainer.