Yes, here's the file, I took it with Checkpoint, and it was located in 'SD/switch/Checkpoint/saves' folder.
Save 1 was the one where I finished the game, save 2 right before the boss and save 3 right after killing the boss and getting the plasma beam.
I took the file from my switch and uploaded it myself, but since I'm a random person on the internet I suggest you scan it with an antivirus before opening the file and bla bla bla.
https://file.io/WiLt0ZdJCMSt
Comment if it works for you
Here it goes
https://easyupload.io/6rk6rr - This one has a 30 day limit. I don't know any other good webs to store files without an account, so if you have any prefference let me know.
Tried downloading from both sites, but both are down.
You can actually upload Switch save files here with no issue, so you can attach the saves in a zip and the file will remain here, without having to rely on outside pages.
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Aside from that, I went ahead and started a fresh playthrough of AM2R with the new version, and indeed, I bumped into the same issue with the Tower Guardian/Sentry.
If you, by any means, shoot and destroy one of the cannons, the game crashes and closes.
You
could probably be able to defeat the boss without taking any of the cannons out, but in Hard or Fusion modes, that is such a painful process, not to mention slow af.
Here's an image of the crash:
You can see the boss in the background and the explosion of the cannon happening as well, behind the error message.
Hope a fix can be achieved for this bug, and the elevator bug from the GFS Thoth back to SR388, in which it never 'stops'--it reaches the destination and then you are still stuck in the animation.
Looking forward to it!