First bin incorrect in HistFactory workspaces

When I convert a multi-channel RooStats::HistFactory::Measurement to a workspace using MakeModelAndMeasurementsFast or MakeCombinedModel, the first bin of the data histograms in each channel is much larger than it should be.

While investigating, I converted a single channel using MakeSingleChannelModel. Here, the first bin has the correct value. (The bin errors are now equal to the bin values, but I think this is because the binned data is saved as an unbinned dataset with one entry per bin, with the weight set equal to the bin value. This seems to be corrected in the combined model though.)

I think @StephanH can most probably help you

The explanation is here:

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