Crash loading save file

[Jordan-Sun]

Describe the bug

Reproducible error while loading save file.

 DEBUG    : contents index greater than contents size

 FUNCTION : deserialize
 FILE     : D:\a\Cataclysm-DDA\Cataclysm-DDA\src\item_location.cpp
 LINE     : 854
 VERSION  : c26c229

Attach save file

Untrimmed save file because save file could not be loaded:
Midwest.zip

Steps to reproduce

Load the save file, the crash will always happen at the same step.

Expected behavior

I expected it not to crash.

Screenshots

No response

Versions and configuration

• OS: Windows 10
• Game version: c26c229
• Graphics version: Tiles
• Ingame language: English
• Mods loaded: None

Additional context

Full debug log:
debug.log

[Jordan-Sun]

Main issue:

(continued from above) ERROR : D:\a\Cataclysm-DDA\Cataclysm-DDA\src\flexbuffer_json.cpp:341 [error_skipped_members] (json-error)
Json error: data/json/monsters/fish.json:1,018:17: <color_white><color_cyan>Invalid or misplaced field name "copy-from" in JSON data</color>

    "name": { "str_sp": "oversized crayfish" },

    "description": "A mutant crayfish the size of a dog, with a brown carapace, claws, and long antennae.",

<color_light_red>    "copy-from": "mon_giant_crayfish",
</color>
               <color_cyan>▲▲▲</color>
    "proportional": { "hp": 0.5, "speed": 1.1, "morale": 0.67, "melee_dice_sides": 0.67 },
    "volume": "30 L",
</color>