Using Bubble App Connector, my repeating group cant use grouping feature

Hi Bubblers,
I am using Bubble app connector as a way to extract data to be used in another Bubble app.

I realise that when I use Repeating Group with the data source from Bubble connector plugin, i cant use the Grouping feature…

It show an error…

Am i doing something wrong or is there a work around ?
thks