Empty columns in grouped view inside Document Library webpart

I am working on a SharePoint Subscription Edition environment, using the modern Document Library webpart.

When using a grouped view with 200 items across 5 groups (each has between 25 and 65 items) inside the webpart, I observe some strange behaviours:

1/ Grouped view set to 'collapsed', item limit set to batches of 10 items

• Upon page load, the groups are displaying the correct number of items in the group
• When I uncollapse a group, only the first item is displayed, the number of items in the group is showing '1' and no data is shown in some columns, though the columns are not empty

  2/ Grouped view set to 'uncollapsed', item limit set to batches of 10 items

• Upon page load, the groups are displaying the correct number of items in the group, BUT I get 30 items in each group (instead of 10)
• From the 11th item in the view, no data is shown in some columns, though the columns are not empty

So far, the only workaround I found is to set my view to 'uncollapsed' and set the item limit to be higher that the total number of items in my library.

Does anyone know how to make the collapsed view work correctly inside a Document Library webpart?