[release and develop] Oversights when loading from savewarps allow for the player getting locked.

This issue specifically affects cases where dungeon entrances and boss doors are decoupled and shuffled with at least 1 other entrance type. This arrangement allows the player's first entry to a dungeon to be through the boss door. From there, the player can then savewarp to the entrance of the dungeon with no way back. Then, if the entrance to the dungeon leads to a boss the player cannot beat, the player will be completely trapped as all savewarp possibilities go back to the entrance to the dungeon, not spawn.

An example where the beginning of shadow leads to volvagia's room

[20-92-37-04-24.json](https://github.com/user-attachments/files/19806037/20-92-37-04-24.json)