diff --git a/src/htmx.js b/src/htmx.js
index 14eb4ed4..d434885e 100644
--- a/src/htmx.js
+++ b/src/htmx.js
@@ -946,6 +946,7 @@ var htmx = (() => {
                 for (let spec of elt._htmx.triggerSpecs || []) {
                     if (spec.interval) clearInterval(spec.interval);
                     if (spec.timeout) clearTimeout(spec.timeout);
+                    Missing: spec.observer?.disconnect()
                 }
                 for (let listenerInfo of elt._htmx.listeners || []) {
                     listenerInfo.fromElt.removeEventListener(listenerInfo.eventName, listenerInfo.handler);