diff --git a/src/event.c b/src/event.c
index f21e346..69b326b 100644
--- a/src/event.c
+++ b/src/event.c
@@ -180,8 +180,9 @@ static inline void ev_focus_out(session_t *ps, xcb_focus_out_event_t *ev) {
 }
 
 static inline void ev_create_notify(session_t *ps, xcb_create_notify_event_t *ev) {
-	assert(ev->parent == ps->root);
-	add_win_top(ps, ev->window);
+	if (ev->parent == ps->root) {
+		add_win_top(ps, ev->window);
+	}
 }
 
 /// Handle configure event of a regular window
@@ -263,8 +264,21 @@ static inline void ev_configure_notify(session_t *ps, xcb_configure_notify_event
 
 static inline void ev_destroy_notify(session_t *ps, xcb_destroy_notify_event_t *ev) {
 	auto w = find_win(ps, ev->window);
-	if (w) {
+	auto mw = find_toplevel(ps, ev->window);
+	if (mw && mw->client_win == mw->base.id) {
+		// We only want _real_ frame window
+		assert(&mw->base == w);
+		mw = NULL;
+	}
+	assert(w == NULL || mw == NULL);
+
+	if (w != NULL) {
 		auto _ attr_unused = destroy_win_start(ps, w);
+	} else if (mw != NULL) {
+		win_recheck_client(ps, mw);
+	} else {
+		log_debug("Received a destroy notify from an unknown window, %#010x",
+		          ev->window);
 	}
 }
 
diff --git a/src/picom.c b/src/picom.c
index bbade20..fcc2a41 100644
--- a/src/picom.c
+++ b/src/picom.c
@@ -303,9 +303,9 @@ uint32_t determine_evmask(session_t *ps, xcb_window_t wid, win_evmode_t mode) {
 	struct managed_win *w = NULL;
 
 	// Check if it's a mapped frame window
-	if (WIN_EVMODE_FRAME == mode ||
+	if (mode == WIN_EVMODE_FRAME ||
 	    ((w = find_managed_win(ps, wid)) && w->a.map_state == XCB_MAP_STATE_VIEWABLE)) {
-		evmask |= XCB_EVENT_MASK_PROPERTY_CHANGE;
+		evmask |= XCB_EVENT_MASK_PROPERTY_CHANGE | XCB_EVENT_MASK_SUBSTRUCTURE_NOTIFY;
 		if (!ps->o.use_ewmh_active_win) {
 			evmask |= XCB_EVENT_MASK_FOCUS_CHANGE;
 		}
diff --git a/src/win.c b/src/win.c
index 10f4424..1a10e06 100644
--- a/src/win.c
+++ b/src/win.c
@@ -53,8 +53,6 @@ static const int WIN_GET_LEADER_MAX_RECURSION = 20;
 static const int ROUNDED_PIXELS = 1;
 static const double ROUNDED_PERCENT = 0.05;
 
-static void win_recheck_client(session_t *ps, struct managed_win *w);
-
 /// Generate a "return by value" function, from a function that returns the
 /// region via a region_t pointer argument.
 /// Function signature has to be (win *, region_t *)
@@ -1031,6 +1029,8 @@ void win_mark_client(session_t *ps, struct managed_win *w, xcb_window_t client)
  */
 void win_unmark_client(session_t *ps, struct managed_win *w) {
 	xcb_window_t client = w->client_win;
+	log_debug("Detaching client window %#010x from frame %#010x (%s)", client,
+	          w->base.id, w->name);
 
 	w->client_win = XCB_NONE;
 
@@ -1074,7 +1074,7 @@ static xcb_window_t find_client_win(session_t *ps, xcb_window_t w) {
  * @param ps current session
  * @param w struct _win of the parent window
  */
-static void win_recheck_client(session_t *ps, struct managed_win *w) {
+void win_recheck_client(session_t *ps, struct managed_win *w) {
 	// Initialize wmwin to false
 	w->wmwin = false;
 
@@ -1084,14 +1084,14 @@ static void win_recheck_client(session_t *ps, struct managed_win *w) {
 	// sets override-redirect flags on all frame windows.
 	xcb_window_t cw = find_client_win(ps, w->base.id);
 	if (cw) {
-		log_trace("(%#010x): client %#010x", w->base.id, cw);
+		log_debug("(%#010x): client %#010x", w->base.id, cw);
 	}
 	// Set a window's client window to itself if we couldn't find a
 	// client window
 	if (!cw) {
 		cw = w->base.id;
 		w->wmwin = !w->a.override_redirect;
-		log_trace("(%#010x): client self (%s)", w->base.id,
+		log_debug("(%#010x): client self (%s)", w->base.id,
 		          (w->wmwin ? "wmwin" : "override-redirected"));
 	}
 
diff --git a/src/win.h b/src/win.h
index d6778b6..4f1ee41 100644
--- a/src/win.h
+++ b/src/win.h
@@ -298,6 +298,7 @@ void win_on_win_size_change(session_t *ps, struct managed_win *w);
 void win_update_wintype(session_t *ps, struct managed_win *w);
 void win_mark_client(session_t *ps, struct managed_win *w, xcb_window_t client);
 void win_unmark_client(session_t *ps, struct managed_win *w);
+void win_recheck_client(session_t *ps, struct managed_win *w);
 bool win_get_class(session_t *ps, struct managed_win *w);
 
 /**