@Katsuya I couldn't see everything in the video since I'm just on my phone right now at lunch. I did notice the green box, starting at around the 4:00 mark, that highlights when you have the mlo selected did not encompass the whole interior. Double check the bbmin and bbmax of it and also the extents.
Also, a better place to get help with mlo stuff and map mods in general would be on the CodeWalker discord.
@leuzinlost If you have a Steam or Epic version all you need to do is a verify integrity (or a reinstall). This will also update you to the current versions. If "other" version, you are on the wrong forums.
@ReNNie i can't explain it. My system was fine until the tuner update. Was going to rollback when I tried that combination as last resort, all values left as default. Since then ive pushed it hard with world addons and it remains very stable. Only French Riviera was troublesome but found solution. Explanation is possibly that you tweaked your values whereas i didn't.
With respect to OP, no reason for 3 addons to crash a system unless really underpowered or bad config settings.