Maps become inaccessible after game crashes

Whenever the game crashes/disconnects while inside a map, the map becomes inaccessible and is considered failed when reloading the game (i.e. back at hideout with no portal). If a crash occurs within a map, this results in:

1. Losing map content (end game mechanics).
2. Losing waystones.
3. Citadels are counted as failed. (I can confirm it, this just happened)

Why isn't map progress retained?

I accept crashes will occur but this feature is the difference between enjoyable and unplayable.