Trust me Zed ... if you have not used the game since the patch yesterday this is what you need to do .
Even if your single player the first time you use the game you are back at the hub/space elevator , you will have no inventory so you have to try and remember where you was in the game the last time you played it. When you find your other self kill it and you get your inventory back.
I found a few odd things as well , all map and compass markers are on but you know how to turn them all off.
Some key bindings have reset themselves as well , example , i use arrow keys to move but after U8 i could not do anything such as place foundations and move at the same time so here my fix for it ..... use main arrow keys to move ... turn on number lock and set up nudge move with the number pad arrow keys , after you have done it turn the number pad key off.
lol I thought you meant you had to go to the game in Epic and kill your other character. They've made a lot of changes to the game. I was only talking about crossplay, which doesn't impact you.
Much of what you are describing isn't supposed to be happening. Your problem is you are playing in the Experimental Branch. You can solve all your problems by not doing that.
Back up your save files and return to the released game. Don't play Experimental unless you start a new game. You are only asking for problems.
If you need help turning off Experimental, let me know. If you decide to stay in Experimental, you are on your own because I'm not playing Satisfactory right now, and I won't be able to help because I'm not 100 percent sure what all the changes are that they've made to the game.
Playing in Experimental on a very old game you've put thousands of hours into like you are doing is kind of crazy and only going to lead to heartbreak. I hope you've kept a lot of old save files.