My test case is on https://trial.tryfoexnow.com/ords/f?p=102:5:10752708676770::NO
Where I set grid as Load on demand and grouping column is DOCDATE
Run page and data showed automatically
This is an Ext JS bug which we are resolving.
You can now download HFXP-3328.zip for v3.0.1 from the support portal to address this issue.