diff --git a/.changeset/cool-peaches-burn.md b/.changeset/cool-peaches-burn.md
index 6bc06d2aa..bed822eab 100644
--- a/.changeset/cool-peaches-burn.md
+++ b/.changeset/cool-peaches-burn.md
@@ -8,4 +8,5 @@ Allow Subclassers of LionCombobox to set '\_syncToTextboxCondition' in closing p
 
 ## Fixes
 
-Allow an extra microtask in registration phase to make forms inside dialogs compatible.
+- form-core: allow an extra microtask in registration phase to make forms inside dialogs compatible.
+- combobox: open on focused when showAllOnEmpty
diff --git a/packages/combobox/src/LionCombobox.js b/packages/combobox/src/LionCombobox.js
index b377bbf76..3de26b7af 100644
--- a/packages/combobox/src/LionCombobox.js
+++ b/packages/combobox/src/LionCombobox.js
@@ -390,6 +390,9 @@ export class LionCombobox extends OverlayMixin(LionListbox) {
    */
   // eslint-disable-next-line class-methods-use-this
   _showOverlayCondition({ lastKey }) {
+    if (this.showAllOnEmpty && this.focused) {
+      return true;
+    }
     // when no keyboard action involved (on focused change), return current opened state
     if (!lastKey) {
       return this.opened;
diff --git a/packages/combobox/test/lion-combobox.test.js b/packages/combobox/test/lion-combobox.test.js
index 4870f59b7..4c3131c41 100644
--- a/packages/combobox/test/lion-combobox.test.js
+++ b/packages/combobox/test/lion-combobox.test.js
@@ -177,6 +177,22 @@ describe('lion-combobox', () => {
         el.autocomplete = 'both';
         await performChecks();
       });
+
+      it('shows overlay on focusin', async () => {
+        const el = /** @type {LionCombobox} */ (await fixture(html`
+          <lion-combobox name="foo" .showAllOnEmpty="${true}">
+            <lion-option .choiceValue="${'Artichoke'}">Artichoke</lion-option>
+            <lion-option .choiceValue="${'Chard'}">Chard</lion-option>
+            <lion-option .choiceValue="${'Chicory'}">Chicory</lion-option>
+            <lion-option .choiceValue="${'Victoria Plum'}">Victoria Plum</lion-option>
+          </lion-combobox>
+        `));
+
+        expect(el.opened).to.be.false;
+        el._comboboxNode.dispatchEvent(new Event('focusin', { bubbles: true, composed: true }));
+        await el.updateComplete;
+        expect(el.opened).to.be.true;
+      });
     });
   });