The general problem with those indicators is that they normally retun 0 when accessing nonexisting data, as is the case during the lookback period. This is sometimes tricky to work around, since it is unknown what they shall return instead.

Maybe this is not properly solved for the Ichimoku. I'll check.

Update: It is indeed so. The Ichimoku has no precautions against returning zero due to nonexisting data. This will be fixed in the next update, but inbetween you can simply solve it by plotting the Ichimoku only when the lookback period is over.