The issue is that the singleplayer world (offline/online) act like a multiplayer world

By that i mean when destroying a block it just spawns again(like it would on multiplayer when lagging), I noticed that i could not pick up items after i died. (frustrating).

Chests sometimes would not open and etc (almost like everything when lagging on multiplayer)

The issue doesnt start immediately after loading up a world, it starts after 10-15 minutes and then it gets worse and worse after more time has passed.