Theres a bug that causes nauvis to disappear from space map when i install the planets

By "install the planets", do you mean the additional optional planets, or just the ones that are marked as Required? Because when playing with just the required mods, Nauvis looks fine to me. If you are running with all of the optional mods, that would include Nauvis Implosion, which destroys Nauvis after a certain time. I don't know what would happen if you install it to an existing playthrough, but it could be causing your issue.

All planets even the optional ones.
I did not install the nauvis implosion. Sometimes nauvis disappear. I have to install the nauvis implosion, save the game to make nauvis reappear. Then uninstall the mod, then load the save to make nauvis reappear

I don't believe any of the optional planet mods should remove Nauvis, except for Nauvis Implosion. It's possible you have another mod that's causing the issues (since you appear to be running with more than just the bare minimum)

it usually happens when people join the server, even if i dont have nauvis implosion installed, nauvis disappears. i dont want nauvis to be destroyed because lignumis and muluna needs nauvis. although i use nauvis implosion to make the planet appear, save, then disable it. then load the game

I feel like this might be caused by a third-party mod. Might need a copy of the save to investigate any further

I'll send you the save. How do I send it? Also there's an incompatibility to lignumis and planet erimos prime. Lignumis changes recipes that need trees. Erimos prime cant progress because there are no trees

right now i have other mods enabled in my save. previously i only installed your mod, with all required planets and optional planets except for nauvis implosion and ghenna.

Also there's an incompatibility to lignumis and planet erimos prime. Lignumis changes recipes that need trees. Erimos prime cant progress because there are no trees

If you are running with Lignumis, you may want to check out the recently released Lignumis Director's Cut, that should add wood to more planets, or perhaps one of the other wooden universe related mods. I haven't played Erimos Prime, but if orbital drops to the planet aren't locked by technology, you should be able to drop wood from space platforms to progress

Of course, since neither mod is a forced requirement, it's up to the planet mods themselves or the user to work out compatibility between them (there is a reason they are optional, after all)

How do I send it?

You can upload your save file to Google Drive, OneDrive, Mega.nz, anywhere is fine if you can provide a working download link

Orbital drops are disabled in erimos prime so its impossible to finish it without recipe tweaker to change recipe

heres the link to the game, right now nauvis is back.
https://drive.google.com/file/d/1cSnmXVhW-Suqe4HTeIo1VjLWtEuvS8HE/view?usp=sharing

Downloaded the save, nothing seems different after about an hour in single player mode (I teleport my character to Muluna and just sat idle there). Gonna try leaving the save running in multiplayer mode overnight, see if anything changes by morning.

I probably should have asked for some more specifics regarding "disappearing" nauvis, i.e. Can ships still travel to where nauvis used to be? Are the ships that were parked in the orbit of nauvis still accessible and viewable? Can you travel by starship to the place where nauvis was? Can you drop from starship into nauvis? Is it just the icon itself that becomes invisible?

Are the routes to nauvis still accessible and viewable? Can you check the properties of nauvis in the Factoripedia? Is nauvis still available on the list of available Surfaces in the list when in the starmap view mode? Are there ever any players on nauvis when this disappearing event occurs? Can you try using the below command to teleport to nauvis, or does it fail for some reason?

/c game.player.teleport({0,0}, 'nauvis')

And just to confirm, you were not using the Nauvis Implosion mod at any point before this occurred? Only after nauvis disappeared, did you enable Nauvis Implosion to (temporarily) bring it back?

And finally, can you provide an image of the starmap when this occurs? That would really help answer most of the above questions. You can upload screenshots to imgur and link them here

Oh, and one minor note, Omnia is a ticking time bomb that you may want to remove from this save; if you research all technologies, such as by attempting to activate /cheat mode or just using the command, Omnia throws an error and sends you back to the main menu; this is an incompatibility with Planetaris Unbounded: Arig, as far as I can tell, (and the Omnia dev hasn't fixed it after two weeks of being initially reported) so if you want to keep Arig (and Planetaris Unbounded: Hyarion, by extension) mod, you will have to drop Omnia (idk what research causes the bug to happen)

The missing nauvis appears usually when someone new joins in the multiplayer server. Ships wont be able to find a path back to nauvis. the ships are still visible if parked in nauvis. nauvis wont appear in space map. ill send you another save file when the error occurs again.

yes i DID not install nauvis implosion mod before. i only installed it to start the countdown of nauvis which makes nauvis appear. then save. unload the mod.

i can teleport using the command

i dont have a photo of starmap but nauvis can be seen but greyed out it looks like it is undiscovered.

ok i will uninstall omnia for now

In the spacemap tool bar nauvis is not displaced. In the map itself its greyed so platforms going to and from nauvis are stuck and can not find path because the routes are grey

If I'm in nauvis, when it disappear it's still playable in nauvis but platforms can not go to nauvis. Possible to teleport to nauvis when in other planets when this happens

Interesting, so it seems like Nauvis isn't exactly 'disappearing', but for some reason, becoming locked?

There was no change for me after letting it run overnight. I can't easily test multiplayer joining and stuff, but if I really have to, to recreate this issue, I suppose I can duplicate the install and try running the modpack twice in mp mode. Though it is unusual that it'd be tied to multiplayer

We're there people who joined the game when you hosted it on multiplayer? It only started happening when I started installing the optional planets. Because a player requested the server to have more planets. After installing the optional planets the nauvis lock or disappear happened. So I'm guessing it's one of the optional planets mods but I'm not sure which one

I usually host game in multiplayer when I'm online, if you join the server the issue might resurface

Disable Foliax setting "Starting Planet". When enabled, if someone starts on Foliax using this setting, it will mark Nauvis as undiscovered. The newest update has made this setting disabled by default.

Disable Foliax setting "Starting Planet". When enabled, if someone starts on Foliax using this setting, it will mark Nauvis as undiscovered. The newest update has made this setting disabled by default.

will try that out

Disabling Foliax as starting planet resolved the issue