Erratic humidity control when >1 piece of HVAC equipment in a zone

One air loop w/ DX coil + VRF fan coil = poor humidity control

I've defined a system with one zone, one air loop, one VRF system, all supposed to control to a specified temperature and relative humidity. Temp control is good. Humidity control is not even close

Details

Some additional details for this issue (if relevant):

• E+ v9.3
• indoor growing facility with equal values for:
  • lots of latent load, defined as a constant rate for 12 hours, then a different rate for the next 12 hours
  • negative value sensible load representing the evaporative cooling effect of the latent load
  • sensible load to represent the heat added by a zone dehumidifer
  • additional sensible load to represent the heat added by a zone dehumidifier's compressor
• Mike Witte took a look at the problem and felt it was a bug, so I'm reporting it.
• Haven't used GitHub before- I hope this is enough info!

Checklist

Add to this list or remove from it as applicable. This is a simple templated set of guidelines.

• Defect file added (list location of defect file here)
• Ticket added to Pivotal for defect (development team task)
• Pull request created (the pull request will have additional tasks related to reviewing changes that fix this defect)
  VRF Humidity control 1zone v93 idf.txt

Start by reproducing the reported humidity-control behavior with the attached “VRF Humidity control 1zone v93 idf.txt” input in EnergyPlus, focusing on the one-zone air loop with a DX coil and VRF system. Compare the simulated relative humidity with the specified control target and identify the relevant HVAC humidity-control path; done means the combined equipment controls humidity as expected without regressing temperature control.