Does the nozzle have too much extension into the filler neck? I’ve noted that nozzles are penetrating further into the filler neck. Have you tried pulling it out a tad? That said, the flow rate generally dictates the shut off level. Too high a flow rate …too much agitation attaining too much height above the liquid level.
Can you manually fill it without interruption? If so, it’s the minimum setting on the pump is your problem.
Since you haven’t gotten a code for the EVAP:PURGE, you probably don’t have any damage to the system.