fix(earthquakes): reject malformed feature properties

docs/CURRENT-STATE.md

@@ -4,6 +4,8 @@
 
 Earthquake refreshes validate the complete feed and construct replacement entities before clearing the previous snapshot. Malformed rows and duplicate rendered IDs retain the last good entities, overlays, count and timestamp and report a malformed response; unknown magnitude is excluded from M2.5+ rendering.
 
+Non-object or array-valued properties reject the response instead of being treated as an unknown magnitude.
+
 Updated: August 24, 2026
 
 ## Installations and map-source guidance