Same issue, KDE desktop, Arch Linux. Only happens for me when Minecraft is in Window mode and on a specific size, for example desktop size (like when you drag the window to the upper edge of the desktop, it will resize to to "problematic" window size).
Firebird
Same issue, KDE desktop, Arch Linux. Only happens for me when Minecraft is in Window mode and on a specific size, for example desktop size (like when you drag the window to the upper edge of the desktop, it will resize to to "problematic" window size).