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Deleting mods from LAN on client breaks it

c2oh25n3o

By c2oh25n3o
in Support & Bug Reports

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c2oh25n3o Tree Puncher

c2oh25n3o

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Hi!

We're playing Minecraft 1.16.5, forge 36.1.0 with my friend on a client with opened LAN (I own the client save file) with a bunch of mods. Our setups are 100% the same, we use CurseForge launcher and have exactly the same profile.

I really wanted to delete a few mods to increase performance a little bit, but when I do so my friend cannot connect to the server - it says 'Failed To Synchronize Registry Data From Server'.

The overall situation is that the save it still somehow attached to the deleted mods - in the live log there are lot of "Found a missing id" lines related to them. 

Besides the missing objects, there is another thing going on - "Unknown structure start", which means that the game is still trying to create structures from deleted mods. I tried cleaning the /DIM-1/regions and /regions folder files with MCStructure cleaner https://github.com/Nyveon/MCStructureCleaner, and it did delete a lot of things there (according to the command prompt), but for some reason the game log shows that those structures are still present, I don't know how that works. But I think that even if I managed to remove missing structures, the missing blocks and entities would still corrupt the save and it would still be impossible to connect. 

So I just really wanna know if there are some solutions to that problem. Is there any way to delete world-changing mods from LAN completely? Or that means once I installed them there is no way to go back?
I've found some information about using a "--forceUpgrade" option when launching the server to upgrade the world, but I'm not sure if it works on client games with open LAN (and if it works in general).

To be more certain, I'm trying to delete these mods: Mushroom Quest, Slimier Slimes, Fins and Tails. I think the first 2 mods are the most problematic because they add new blocks to the world generation. But I used to face the same issue when deleted different other mods in the past, they all just change the world somehow. Removing utility mods (e.g. Performant, Ambient Sounds, Carry on) obviously doesn't cause any trouble (as well as removing some small mods adding items, like Artifacts, Magic Mirror, TorchBow, AntiqueAtlas etc.)

I know I should provide both log files but the one I have is 6x times bigger than I can upload so below I'll put some of the lines appearing in it (there are a LOT of similar ones - I didn't include all of them), and my friend's log file is here.

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Edited by c2oh25n3o

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