help(OverlayContainer): FullscrenOverlayContainer not applying our theme

[Razgort]

Hi guys, we recently started to use the overlay container module with the class FullscreenOverlayContainer.
In order to open modals in fullscreen mode.
It was working fine, but after that we tried to apply our theme to the modal.
And the theme is correctly applyed in fullscreen mode. But not on normal mode any more, see below screens

this is with full screen below see theme and css class applied

this is with normal screen mode below see theme not applied and css class disappeard

Do you guys have any idea why ? Or is it a bug ?

Environment

• Angular: Angular 10.0.0
• CDK/Material: angular material 10.0.8
• Browser(s): chrome
• Operating System (e.g. Windows, macOS, Ubuntu): Windows

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