diff --git a/packages/vue-instantsearch/src/util/vue-compat/index-vue2.js b/packages/vue-instantsearch/src/util/vue-compat/index-vue2.js
index 6177a8eca6a..1cf8dd6ce09 100644
--- a/packages/vue-instantsearch/src/util/vue-compat/index-vue2.js
+++ b/packages/vue-instantsearch/src/util/vue-compat/index-vue2.js
@@ -9,8 +9,8 @@ export { Vue, Vue2, isVue2, isVue3, version };
 
 const augmentCreateElement =
   (createElement) =>
-  (tag, propsWithClassName = {}, ...children) => {
-    const { className, ...props } = propsWithClassName;
+  (tag, propsWithClassName, ...children) => {
+    const { className, ...props } = propsWithClassName || {};
 
     if (typeof tag === 'function') {
       return tag(
@@ -23,12 +23,33 @@ const augmentCreateElement =
 
     if (typeof tag === 'string') {
       const { on, style, attrs, domProps, nativeOn, key, ...rest } = props;
+      // React-style `onClick` / `onAuxClick` props (e.g. from shared
+      // `instantsearch-ui-components` JSX) need to be remapped to Vue 2's
+      // `on: { click, auxclick }` event API so they don't fall through to
+      // `attrs` and end up rendered as literal HTML attributes.
+      const reactStyleHandlers = {};
+      const remainingAttrs = {};
+      Object.keys(rest).forEach((prop) => {
+        if (
+          prop.length > 2 &&
+          prop[0] === 'o' &&
+          prop[1] === 'n' &&
+          prop[2] === prop[2].toUpperCase() &&
+          typeof rest[prop] === 'function'
+        ) {
+          reactStyleHandlers[prop.slice(2).toLowerCase()] = rest[prop];
+        } else {
+          remainingAttrs[prop] = rest[prop];
+        }
+      });
       return createElement(
         tag,
         {
           class: className || props.class,
-          attrs: attrs || rest,
-          on,
+          attrs: attrs || remainingAttrs,
+          on: Object.keys(reactStyleHandlers).length
+            ? Object.assign({}, reactStyleHandlers, on)
+            : on,
           nativeOn,
           style,
           domProps,
@@ -51,6 +72,17 @@ export function renderCompat(fn) {
   };
 }
 
+/**
+ * Fragment shim for the augmented JSX renderer used by `renderCompat`.
+ * Functional pragmas in `instantsearch-ui-components` use
+ * `<Fragment>{children}</Fragment>` to skip wrapping markup; Vue 2 has no
+ * native fragment, so we return the children array directly and let Vue 2
+ * flatten it into the surrounding vnode.
+ */
+export const Fragment = function Fragment(props) {
+  return props && props.children !== undefined ? props.children : null;
+};
+
 export function getDefaultSlot(component) {
   return component.$slots.default;
 }
diff --git a/packages/vue-instantsearch/src/util/vue-compat/index-vue3.js b/packages/vue-instantsearch/src/util/vue-compat/index-vue3.js
index 8d8ee1e7007..a2352f54856 100644
--- a/packages/vue-instantsearch/src/util/vue-compat/index-vue3.js
+++ b/packages/vue-instantsearch/src/util/vue-compat/index-vue3.js
@@ -4,14 +4,28 @@ const isVue2 = false;
 const isVue3 = true;
 const Vue2 = undefined;
 
-export { createApp, createSSRApp, h, version, nextTick } from 'vue';
+export { createApp, createSSRApp, h, version, nextTick, Fragment } from 'vue';
 export { Vue, Vue2, isVue2, isVue3 };
 
 export function renderCompat(fn) {
   function h(tag, props, ...childrenArray) {
     const children = childrenArray.length > 0 ? childrenArray : undefined;
+    // Components from `instantsearch-ui-components` are React-style functional
+    // components that read `children` from props. Vue 3 instead puts children
+    // in `slots.default`, which would leave `children` undefined and break
+    // components like `Button` that render `{children}`. Mirror the Vue 2
+    // augmented `h` and forward children as a prop for plain function tags
+    // (excluding Vue's own components/symbols like `Fragment`).
+    if (typeof tag === 'function') {
+      return Vue.h(
+        tag,
+        Object.assign({}, props || {}, { children }),
+        children
+      );
+    }
     if (
       typeof props === 'object' &&
+      props !== null &&
       (props.attrs || props.props || props.scopedSlots || props.on)
     ) {
       // In vue 3, we no longer wrap with `attrs` or `props` key.