Hello,

I have noticed that in some chunks of my game , the game "increase drastically" the ms ticks

the value increase as soon as a switch from a normal chunk to a problematic one. ( always > 140 when there is an issue and always < 50 when there is not)

As far as i understand, This high value generate several bugs in the impacted chunks : minecart extremely slow and laggy, mining bug ( the mined block reapear for 1 or 2 sec ) , red stone timers are not working etc.. ). general behavior is that the chunks seems very laggy. 

some chunks are so impacted ( >200 ) that the game is unplayable .

I saw that there issue have been reported for 1.14 + ( MC-138550) but not for 1.15.2 that is why i post this one.

Edit : map loaded in 1.16 RC1: 

reduced in intensity : from  >200 => to 70/80 in the impacted chunks

i have done a new debug report.

game is playable , however difference is still clearly visible. btw the chunks impacted and those that aren't. ( ms tick value is *2 ) 

Nb : I checked as i was thinking that it might affects the "most transformed" chunks vs the untouched , but seems not related ( some impacted chunks were not modifed since generation at all)