Really looks like a GTK or WM bug to me. The part you don't see are the part that shuold work the best: they are drawn by GTK itself, with little to no customization on our part.
Interestingly, it probably also corresponds to the double-buffered part of the app.

Maybe try disabling composition on your WM.

And in all cases, 1.25 isn't too recent, maybe something got fixed since then.

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