Overlay widget is on top of contents but translucent?

Platform
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1

i’m using a GtkOverlay to position a widget on top of another one. Unexpectedly to me, the overlay is on top of the child widget (as i wanted), but translucent: i can see the child widget through it.

I wanted it to be opaque (and interactive=can-target).

I currently have roughly this hierarchy:
GtkBox
\ GtkBox
\ AdwToastOverlay
\ GtkOverlay
\ GtkScrolledWindow
\ contents…
\ SearchBar <— on top of the scrolled window as expected, but see-through
\ GtkBox
\ GtkSearchEntry
\ GtkButton
\ GtkButton

At first I thought the overlay was under the contents, but now i think they’re on top, but without any background.

If that helps, this is a gtkrs4 app, here is the commit in which I’m trying to add the overlay and the overlay widget:

2

so it seems to be adwaita styling. if i set the style class “view” or “background” on the widget to be overlayed, it’s no longer translucent.

3

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