🇬🇧United Kingdom @jamesgeldart

It's really weird, but it seems like it's putting the start and end timestamps the wrong way round into the query:

SELECT "node_field_data"."nid" AS "nid"
FROM
{node_field_data} "node_field_data"
LEFT JOIN {node__field_tutor} "node__field_tutor" ON node_field_data.nid = node__field_tutor.entity_id AND node__field_tutor.deleted = '0' AND (node__field_tutor.langcode = node_field_data.langcode OR node__field_tutor.bundle = 'student')
LEFT JOIN {node__field_start} "node__field_start" ON node_field_data.nid = node__field_start.entity_id AND node__field_start.deleted = '0' AND (node__field_start.langcode = node_field_data.langcode OR node__field_start.bundle = 'event')
WHERE (((node__field_tutor.field_tutor_target_id = '17')) AND (("node__field_start"."field_start_value" > '1682895599') AND ("node__field_start"."field_start_value" < '1677628800'))) AND (("node_field_data"."status" = '1') AND ("node_field_data"."type" IN ('lesson')))

The code looks fine, but when I swap the < and > round on lines 633 and 634 of src/Plugin/views/style/CalendarViewBase.php it works