I was doing a SOLW speedrun - https://www.speedrun.com/mcce#Stack_of_Lime_Wool and I was on a run I thought was dead, then I tabbed out to check the time and it was record pace, and I end up finishing the run 2 seconds behind WR. Does pausing the game also pause the timer? If so, then its WR. Please let me know

You should probably ask this question in the minecraft game forums, not here. https://www.speedrun.com/mcce/forum Over there, you can get help from other runners, but on the general site forums it's not likely you'll get help from someone who runs that game.