I recently release v5 of ember-mobile-menu and v6 of ember-gesture-modifiers. They're now v2 addons!
Additionally, v5.1.0 should make ember-mobile-menu work with Fastboot again.
https://github.com/nickschot/ember-mobile-menu/releases/tag/v5.0.0
https://github.com/nickschot/ember-gesture-modifiers/blob/master/CHANGELOG.md#v601-2023-12-21