a some kind of complex codes popping up on the centre of the screen

when i load a world or just randomly pops up some kind of codes or something

steps to reproduce
those appear on the screen randomly especially more when you load up a world

Observed Results
as right now for me in 1.17.41 bedrock edition what is happening is that codes are appearing on the screen like mentioned before

Expected Results
those codes or those stuff should not appear. it started appearing after yesterday(21/11/2021)