No shift time. This is a normal, because Zorro don't know MT4 Timezone. During the market time is easy get the shift. But in the SA/SU not work. And in Zorro.mq4 is this code:

int time = (int)iTime(Asset,timeframe,shift);
arr[4] = time + 60*timeframe; // assume tick start time

In this case must be say in Zorro for each brokerPlugin correct timezone and during store in .t6 transform into UTC timezone. I don't have the source this plugin.

I make my workaround - change M1 candle timezone to UTC. But must be change every DST 2/3