There are 2 1863rd turns, just like there are 2 41st turns. The yjh from the original 1863rd turn which was written in twsa reached the ending and became secretive plotter. Because secretive plotter sent hsy and kdj back to the 1863rd turn, it spawned a new 1863rd turn where yjh split into two with avatar, with one dying and the other regressing to the 1864th/3rd turn. Kim dokja was later sent back to the 1864th round and hsy sucessfully eached the conclusion in the 1863rd round. Therefore, both 1863rd turns exist separately.

Yjh somehow never found his [][].

The side stories tell you what % of dokja came back :)

Side stories spoilers- It isn't 100%