League of Legends losing cursor capture

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Due to a owning a Laptop with a weird aspect ration I can't play league in fullscreen without losing part of the visible map.

However, when playing in windowed mode (also in borderless or fullscreen with the reduced resolution), the window randomly stops locking in the cursor. Tabbing in and out sometimes fixes this and sometimes it doesn't. I first thought this may only happen when quickly flicking the cursor around but it also randomly happens when just slowly moving the cursor onto the edge of the window.

recording2.webm

I am running river on it's latest commit on arch linux. League of Legends runs on wine and through xwayland.