diff --git a/src/scene/mod.rs b/src/scene/mod.rs
index 19d3bbb62..9e51e2153 100644
--- a/src/scene/mod.rs
+++ b/src/scene/mod.rs
@@ -1012,6 +1012,13 @@ impl Scene {
                 if c.invisible {
                     return false;
                 }
+                // Block/BlockEnd are block-defn sentinels, not drawable geometry.
+                // Without this skip they fall through to legacy_geometry's `_`
+                // arm and emit a 1-unit phantom segment at world_offset that
+                // poisons fit_all and shows up in selection.
+                if matches!(e, EntityType::Block(_) | EntityType::BlockEnd(_)) {
+                    return false;
+                }
                 if self
                     .document
                     .layers