The Slate.ApplyDisabledEffectOnWidgets not works for RetainerBox children

Hi everyone,

We have encountered a rendering issue involving RetainerBox. It seems that child widgets rendered inside these containers do not retain the IsInGameLayer flag during the rendering process. As a result, even when the CVar Slate.ApplyDisabledEffectOnWidgets is set to false, the DisabledEffect draw flag is still applied, causing unwanted opacity on disabled elements.

This behavior makes it impossible to rely on Slate.ApplyDisabledEffectOnWidgets=0 in combination with RetainerBox-based UI (for example, when using RetainerBox for effects), since disabled elements still appear semi-transparent.

Is this the intended behavior?
Thanks in advance for your help!