Updating a world from 18w16a to 1.13pre1 gives me a different inventory / spawn point

The bug corrupts my map and my in-game Map items, as well as giving me seemingly an inventory and spawn point from months previous. I've changed my in-game name since then and it always seems to backpedal to the same point.

In-game names have been (in order): Emoticon64, 039, Paperb_y

This has been happening for every single snapshot after 18w16a for me, on this world especially.

A similar bug was fixed post 17w50a, according to my profiles of Minecraft (screenshot attached). I've had to stay on that snapshot a while, but I was able to update to this one eventually. Same situation with 18w16a.

I can only play normally without this bug in 18w16a.

World download: https://drive.google.com/drive/folders/1D0RzfW5P3ZoqkOHYV_7Zo4HvZXr4IDg8?usp=sharing