A for realoadning chunks and game paused whithaout save game

My game is pausing from 1.15.I play minecraft and then this is show me and i then go in 1.10 play .This is so frustrating bug.(I play on laptop and i didn't press FN for this(i press A for move left then my chunks are realoading and i have 101 fps and then my game is wery laggy))

This bug is for 5 minutes.

 

{{1.Go and play minecraft for 1-9 hours }}

{{2.You may have f3 rancid }}

3.if you have 45-~ ~ fps then click A,T,D or ESC on your PC(if in chat debug say realoading chunk then that bug is going to be at least }}{{5-10 minutes InRealLife