I have also been told to let the paint completely gas off before applying topcoat. That may be more of an acrylic thing, but fully curing should at least give the the top coat less to react too.
I have applied clear immediately after the base coat has flashed without issue, with both automotive acrylic thinned and sprayed through my gun, as well as Duplicolor rattle cans. I'm 99.9% sure (it was 2 years ago ) I allowed the Dulux base coat to gas off at least over night.
I have no logical reason for the reaction that followed other than "stuff" happens .