Hello Dustin,
It is possible that the Bricks builder is not compatible with MB Group to render the datepicker field on the frontend. I've used this code to display the datepicker field as well
$groups = rwmb_meta( 'event_group' );
foreach ($groups as $group) {
echo date( 'F j, Y', $group['start_date']['timestamp'] );
}
Note: the datepicker field with the option timestamp enabled save the value to the database in an array: timestamp and formatted, for example:
[start_date] => Array
(
[timestamp] => 1678320000
[formatted] => 2023-03-09
)
FYI, Bricks builder maintains the integration with Meta Box so I recommend contacting their support to ask for further assistance. Please read more here https://docs.metabox.io/compatibility/