I have 2 different installs of Statamic. After updating to 1.11.0 grouped_by_date stoppend working. Statamic loops through the results an outputs all my blog titles, but not the
{{ grouped_date }}
part. {{grouped_date }} ist just empty. I tried differerent formats in group_by_date="F Y" like just "F" oder "Y" or "M"
but it didn´t work.