Embed sandbox does not hide navigation above 1280px width

[lio-p]

Trying to embed a sandbox in a wide iframe lead to show the navigation panel even with hidenavigation: 1 set. This happens when setting the width to a size higher than 1280px.

Example that works as expected:
width:1280px

<iframe src="https://codesandbox.io/embed/new?fontsize=14&amp;hidenavigation=1&amp;hidedevtools=1&view=preview" style="width:1280px;height:1000px;border:0;border-radius:4px;overflow:hidden" sandbox="allow-modals allow-forms allow-popups allow-scripts allow-same-origin"></iframe>

Example that does not work as expected. The navigation column gets display.
width:1290px

<iframe src="https://codesandbox.io/embed/new?fontsize=14&amp;hidenavigation=1&amp;hidedevtools=1&view=preview" style="width:1290px;height:1000px;border:0;border-radius:4px;overflow:hidden" sandbox="allow-modals allow-forms allow-popups allow-scripts allow-same-origin"></iframe>