For a while chrome/chromium has been getting stuck with the mouse pointer. Can no longer click in pages when this happens. Seems due to event handling change in kwin, they should have provided fixes. Relevant info here: https://bugs.kde.org/show_bug.cgi?id=482142 and https://issues.chromium.org/issues/336449364
Having this on KDE/plasma 5 by the way, do have some Qt 6 components installed, but I'm not on plasma 6. Affects 5 as well, might be due to installed Qt 6 components. There's others with plasma 5 reporting further down the bug reports. I have to kill my browser many times a day, so kind of eager for the fix :)
For me this was fixed in plasma 5 by upgrading to chromium 126.