diff --git a/library/src/components/timetable/TimeTableRows.tsx b/library/src/components/timetable/TimeTableRows.tsx
index 22df82cd..67f808ef 100644
--- a/library/src/components/timetable/TimeTableRows.tsx
+++ b/library/src/components/timetable/TimeTableRows.tsx
@@ -326,6 +326,12 @@ export default function TimeTableRows<
 						}
 					}
 				}
+				console.log(
+					"TimeTable - updated intersected group rows from",
+					prev,
+					"to",
+					newRenderCells,
+				)
 				renderGroupRangeRef.current = newRenderCells
 				return newRenderCells
 			}