This is actually a bug that has been fixed in Onsen UI but not released yet (https://github.com/OnsenUI/OnsenUI/pull/2595). There should be a release with the fix in a week or so.
If you need the fix right now then clone Onsen UI from GitHub and build it locally. There are instructions here: https://github.com/OnsenUI/OnsenUI/blob/master/CONTRIBUTING.md#development-setup. Once it’s built you can use
npm link to use the local version of Onsen UI in your project.
I hope this helps resolve your problem. If you get stuck please let us know.