I have written about it somewhere here ... The behaviour was here a bit different, but still rather unusable. A good solution would be to eliminate that key for MacOS. I frequently use the fullscreen mode available via the system window decorations. It would of course be even slightly better if the key could be redirected to do the same, bu it's not really an issue. It's been like that and nobody ever even noticed.
Now it came up only due to thick-finger-wrong-button-testing.