Adding this as a separate post to this thread as it tracks a different dictionary (randomly generated dungeon dictionaries), but the principal is the similar. It's attempting to access Dictionary elements using a key which isn't stored in the ResourceScripts.game_world.rooms dictionary:
SCRIPT ERROR: Invalid get index 'L59L1 10' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 10' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 12' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 12' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 13' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 13' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 15' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 15' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 16' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 16' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 17' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 17' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 20' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 20' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 21' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 21' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 22' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 22' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 10' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 10' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 12' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 12' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 13' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 13' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 15' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 15' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 16' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 16' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 17' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 17' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 20' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 20' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 21' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 21' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 22' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 22' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 10' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 10' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 12' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 12' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 13' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 13' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 15' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 15' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 16' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 16' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 17' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 17' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 20' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 20' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 21' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 21' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 22' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 22' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 10' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 10' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 12' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 12' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 13' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 13' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 15' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 15' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 16' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 16' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 17' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 17' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 20' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 20' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 21' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 21' (on base: 'Dictionary'). SCRIPT ERROR: Invalid get index 'L59L1 22' (on base: 'Dictionary'). at: update (res://gui_modules/Exploration/Scripts/room.gd:24) - Invalid get index 'L59L1 22' (on base: 'Dictionary').