so i was playing around in the new version when i noticed something. 

while flying around and pressing esc the game would pause, when i have pause on lost focus disabled so it shouldn't. i pressed F3+P to see what was going on and it only then activated pause on lost focus. when pressing it again to turn it off it was still pausing. very peculiar. but then when i open the game to LAN suddenly it did the opposite, no matter what pause on lost focus was set so it didn't pause the game

it does so with cheats on or off, also checked with all datapacks disabled