fix(manager): keep settings grid usable after delete

manager/assets/modext/widgets/core/modx.grid.js

@@ -1554,7 +1554,9 @@ Ext.extend(MODx.grid.GridBase, Ext.grid.EditorGridPanel, {
         }
         const
             { record } = this.menu,
-            saveParams = this.config.saveParams || {},
+            // Clone — mutating config.saveParams leaks remove action/key into later
+            // autosave UpdateFromGrid payloads (#14280).
+            saveParams = Ext.apply({}, this.config.saveParams || {}),
             primaryKey = this.config.primaryKey || 'id'
         ;
         text = text || 'confirm_remove';
@@ -1580,8 +1582,11 @@ Ext.extend(MODx.grid.GridBase, Ext.grid.EditorGridPanel, {
     },
 
     removeActiveRow: function(record) {
-        if (this.fireEvent('afterRemoveRow', record)) {
-            const selection = this.getSelectionModel().getSelected();
+        if (!this.fireEvent('afterRemoveRow', record)) {
+            return;
+        }
+        const selection = this.getSelectionModel().getSelected();
+        if (selection) {
             this.getStore().remove(selection);
         }
     },

manager/assets/modext/widgets/core/modx.grid.settings.js

@@ -300,7 +300,11 @@ MODx.grid.SettingsGrid = function(config = {}) {
             }
         },
         afterRemoveRow: function() {
+            // Reload filters + grid. Return false so removeActiveRow does not also
+            // store.remove(selection) — that races the refresh and can drop another
+            // row, so later edit/delete hits setting_err_nf (#14280).
             this.refreshFilterOptions(gridFilterData);
+            return false;
         }
     });