ZK Screen is opening only 70% - unplayable

In 1 from ca. 10 games, zk open false.
often i close all, lobby / spring and i rejoin. then will work.
this is in 90%.

in 10% i close and open zk lobby and rejoin, but not fix.
all settings are "normal" also not "windowed" iam play "Full Screen".

Try going into chat and entering /fullscreen twice.

Some lobster named RandomX posted this issue in another thread, but was completely ignored by anyone who can do anything about it. The workaround that worked, for now, is to replace fullscreen mode with fullscreen window in the lobby settings.