Loading worlds issue:

If I join a world, it will load fine, but if I leave, it will no longer be able to load another world, and it will not run the world (it's still playable, but you need to reload the game to just join another world)

Random crashes:

It will crash the game randomly with the exit code -1 saying: "issues with loading chunks", or something like that

Edit: I believe it is tied to worlds, as i started a new survival world, and I don't have the issue anymore. so it must be tied to the world data in some way (Yes i know this is a dupe of #345, it goes into more detail, however i am wanting to add my own comment)

We're going to need more information. Let's start with the full logs when the crashes happen. When the crash happens it should tell you a filename that has more information. Please cause a crash and attach the resulting log file the crash screen points to.

Possibly a duplicate of #345?

Possibly a duplicate of #345?

Probably, but we're going to need more to go on to completely discount any chance of it being an unrelated issue we haven't learned about yet.

Possibly a duplicate of #345?

Probably, but we're going to need more to go on to completely discount any chance of it being an unrelated issue we haven't learned about yet.

Fair point!