Version 1.17.40. New issues with extreme mob/entity lagging. Mobs spawn less and move slowly. Player can move and attack normally but monsters are glitchy and don't always receive hits they should. Also lag with other entities like blocks when mined are laggy and delay picking up.
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We're tracking this issue in MCPE-120971, so this ticket is being resolved and linked as a duplicate.
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I met the same problem.However,this bug is the problem of the low Tps.So please see my bug report:MCPE-145848