BATTLETECH - Battletech campaign not appearing in game.

[RogueSpear]

One line summary of your issue
Battletech campaign not appearing in game.

What platform are you running the game on?

Steam

What operating system do you use?
Windows 10
Which version of the game are you running?
1.8.1-640R
What DLC do you have installed?
Flashpoint,
Urban Warfare,
Heavy Metal

Please explain your issue is in as much detail as possible.
I have been playing an Ironman campaign save for the last couple of weeks. The save worked perfectly fine yesterday, today it has disappeared and trying to continue/load a game loads the last non-ironman game I played. I have tried:
Exiting and restarting.
Exiting and restarting from main menu.
Logging in and out of my paradox account in the menu.
Verifying game files.
Restarting steam and relaunching the game.

As far as I can tell, the save is still present on my computer, located in folder CR1, but for some reason only the non-ironman saves in SGS1 are appearing in game. File from CR1 attached, if this is not the campaign my mistake. It has the timestamp from when I finished playing yesterday so I assume at the least it is related.
Have you tried verifying your files?
Yes

Steps to reproduce the issue
Unfortunately I have no idea. I quit the game normally from the in game menu yesterday.

Attach DxDiag (PC), System Info log (Mac), or run sudo lshw -html > specs.html and uploaded specs.html (Linux)

Attach Output Log
Windows: \Users\YourUserName\AppData\LocalLow\Harebrained Schemes\BATTLETECH\output_log.txt
Mac OS: Users >{name} > Library > Logs > Unity > Player.log
Linux: ~/.config/unity3d/Harebrained Schemes/BATTLETECH/Player.log

If the game crashed, please attach the crash file with the time stamp closest to the crash.
Windows: [Steam library folder]\steamapps\common\BATTLETECH\DumpBox
For v.17 and beyond try here: C:\Users\[YourUserName]\AppData\LocalLow\Harebrained Schemes\BATTLETECH
OSX: Macintosh HD > Users > [username] > Library > Application Support > Steam > steamapps > common > BattleTech > DumpBox
Linux: [Steam library folder]/steamapps/common/BATTLETECH/DumpBox

If a save game was loaded at the start of the game session, upload it. Please make sure to upload the save game with the timestamp closest to when you loaded it.
Windows:
Steam: [Steam installation folder]\userdata[SteamID]\637090\remote\C0\SGS1
GOG: 'C:\Users\USER_ID\AppData\Local\GOG.com\Galaxy\Applications\50593543263669699\Storage\Shared\Files\C#\SGS#'
Vanilla:'C:\Users\USER_ID\AppData\LocalLow\Harebrained Schemes\BattleTech\C#\SGS#'
OSX:
Steam: Macintosh HD > Users > [username] > Library > Application Support > Steam > userdata > [SteamID] > 637090 > remote > C#> SGS#
GOG: Macintosh HD > Users > [username] > Library > Application Support > GOG.com > Galaxy > Applications > 50593543263669699 > Storage > Shared > Files > C# > SGS#
Vanilla: Macintosh HD > Users > [username]> Library > Application Support > unity.Harebrained Schemes.BattleTech > C# > SGG#
Linux:
Steam: /home/.steam/steam/userdata/[steamID]/637090/remote/C#/SGS#
GOG: /home/[username]/.config/unity3d/Harebrained Schemes/BATTLETECH/remote/C#/SGS#/
Vanilla: /home/[username]/.config/unity3d/Harebrained Schemes/BATTLETECH/remote/C#/SGS#/

Attach screenshot / video

 

[RogueSpear]

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[Timaeus]

That looks to be too small to be a good save file. It's possible that it's either not the right one, or is unfortunately corrupted.

 

[RogueSpear]

I really hope it's the wrong one and the right one is recoverable. I've sunk 40+ hours into it, far too many to stomach a restart