Why is my Firefox window appearing underneath the application sidebar after unlocking my device?

After running software updates on Ubuntu 22.04.05, my Firefox (137.0) window is suddenly behaving strangely; after I lock and unlock my computer, the window for some reason appears behind my application sidebar. This continues even if I move the focus to the Firefox window; I have to shrink and then expand the window again to get the window back to its proper size and position.

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Why is my Firefox window appearing underneath the application sidebar after unlocking my device?

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