diff --git a/services/web/frontend/js/features/source-editor/utils/layer.ts b/services/web/frontend/js/features/source-editor/utils/layer.ts
index 8e96ecb39d..7f3bbc8701 100644
--- a/services/web/frontend/js/features/source-editor/utils/layer.ts
+++ b/services/web/frontend/js/features/source-editor/utils/layer.ts
@@ -173,7 +173,10 @@ function rectanglesForRange(
       : drawForWidget(endBlock, true)
     const between = []
 
-    if ((visualStart || startBlock).to < (visualEnd || endBlock).from - 1)
+    if (
+      (visualStart || startBlock).to <
+      (visualEnd || endBlock).from - (visualStart && visualEnd ? 1 : 0)
+    )
       between.push(piece(leftSide, top.bottom, rightSide, bottom.top))
     else if (
       top.bottom < bottom.top &&