diff -ur baikal-0.7.1-dist/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php baikal-0.7.1/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php
--- baikal-0.7.1-dist/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php	2020-03-20 09:55:46.000000000 +0100
+++ baikal-0.7.1/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php	2020-06-16 09:39:19.510374647 +0200
@@ -788,9 +788,9 @@
 
                 // If start time OR the end time is not specified, we can do a
                 // 100% accurate mysql query.
-                if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['prop-filters'] && (!$timeRange['start'] || !$timeRange['end'])) {
-                    $requirePostFilter = false;
-                }
+//                if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['prop-filters'] && (!$timeRange['start'] || !$timeRange['end'])) {
+//                    $requirePostFilter = false;
+//                }
             }
         }