IC2 Blocks are lost when transporting an older version of save to a newer version of MC

  • I tried directly transporting my old IC2 save files from MC 1.12.2 to MC 1.19.2. However, I found almost all IC2 items (machines, building blocks, etc) were lost in 1.19.2. I've put a lot of effort into this save and I want to continue it in newer versions of both MC and IC2. How can I solve this problem?

    Thanks for your attention! :thumbup:


    JAVA MC (1.12.2), Forge (14.23.5.2838), IC2 (industrialcraft-2-2.8.222-ex112.jar).

    JAVA MC (1.19.2), Forge (43.2.0), IC2 (industrialcraft-2-2.9.1+ex119-1.19.2-forge.jar)


  • krbbbb

    Changed the title of the thread from “IC2 Blocks are lost when transporting an older version of IC2 save (2.8.222 for MC 1.12.2) to a newer version of MC (2.9.24 for MC 1.19.2)” to “IC2 Blocks are lost when transporting an older version of save to a newer version of MC”.
  • Are you sure the 1.19.2 version of the mod is really IC2? As far as I'm aware, there are no official ports of IC2 to 1.19.2 with the exception of Speiger's IC2 Classic, so the mod you are using is probably a different one like Tech Reborn or some such that seeks to imitate IC2 as closely as possible. In that case, the blocks do not load upon opening the world because the mod they come from is no longer present, even though an extremely similar mod is present. Perhaps try again with IC2 Classic for 1.19.2. If that doesn't work, then it is probably simply not possible to transfer your IC2 save file from 1.12.2 to 1.19.2.


    Also, IC2 Classic is not exactly the same as what you were using in 1.12.2, which looks like it's probably IC2 Experimental. You see, first there was IC, then came IC2, then IC2 branched out into IC2 Experimental and IC2 Classic, where both have IC2 as a base but add different stuff. A good way to test if you are running IC2 Experimental instead of plain IC2 is if the mod includes something called a "Fluid Reactor", which is an upgraded version of the regular Nuclear Reactor that is substantially more complex to generate power with but can produce greater quantities of power. If you are running IC2 Experimental, then the Experimental-specific stuff (such as the fluid reactor, and probably lots of other stuff) definitely will not be recognized by IC2 Classic. However, there is still a chance that the original IC2 stuff will be recognized in the save file when using IC2 Classic, so it's definitely worth a try.

  • Yes, ic2 experimental exists on 1.19 https://jenkins.ic2.player.to/job/IC2/job/1.19/.


    It is generally not possible to seamlessly port worlds across minecraft versions due to the numerous changes they go through when porting. Blocks and items that existed in the mod in 1.12 may not exists in 1.19 and vice versa. You're also not getting any of the new vanilla worldgen changes either. Porting worlds across versions is not recommended and will likely result in world corruption.


    If you want to start playing a new mc version, especially when the difference is this huge, you'll have to start over.

  • Yes, ic2 experimental exists on 1.19 https://jenkins.ic2.player.to/job/IC2/job/1.19/.


    It is generally not possible to seamlessly port worlds across minecraft versions due to the numerous changes they go through when porting. Blocks and items that existed in the mod in 1.12 may not exists in 1.19 and vice versa. You're also not getting any of the new vanilla worldgen changes either. Porting worlds across versions is not recommended and will likely result in world corruption.


    If you want to start playing a new mc version, especially when the difference is this huge, you'll have to start over.

    Looking at that link, it appears to still be in very early development. It states directly that it is not yet stable and breaking changes may happen with updates. Perhaps IC2 Experimental has always been this way, but I still get the feeling that this isn't ready for use yet. But yes, I do stand corrected about no official IC2 versions existing for 1.19.2 besides IC2 Classic.

  • Yes, ic2 experimental exists on 1.19 https://jenkins.ic2.player.to/job/IC2/job/1.19/.


    It is generally not possible to seamlessly port worlds across minecraft versions due to the numerous changes they go through when porting. Blocks and items that existed in the mod in 1.12 may not exists in 1.19 and vice versa. You're also not getting any of the new vanilla worldgen changes either. Porting worlds across versions is not recommended and will likely result in world corruption.


    If you want to start playing a new mc version, especially when the difference is this huge, you'll have to start over.

    Yes, this might be the reason. In the beginning, I thought although the codes of the original MC blocks may change significantly in different MC versions, most codes of IC2-exp blocks may not change in different versions of IC2-exp for simplicity during the development of the mod, so that items may still be identified correctly in different versions of MC. Now this hypothesis seems false. Maybe I have to start over in 1.19.2. Anyway, thanks for your help!

  • Looking at that link, it appears to still be in very early development. It states directly that it is not yet stable and breaking changes may happen with updates. Perhaps IC2 Experimental has always been this way, but I still get the feeling that this isn't ready for use yet. But yes, I do stand corrected about no official IC2 versions existing for 1.19.2 besides IC2 Classic.

    I'm sure I'm using IC2-exp rather than the classic one. I also tried the latest version (industrialcraft-2-2.9.24+ex119-1.19.2-forge.jar) but blocks were still lost. I hope a newer and more stable version could solve this. Thanks for your help!

  • I'm sure I'm using IC2-exp rather than the classic one. I also tried the latest version (industrialcraft-2-2.9.24+ex119-1.19.2-forge.jar) but blocks were still lost. I hope a newer and more stable version could solve this. Thanks for your help!

    Yeah don't expect any Major MC version Jump to be going well for your world.
    There is kinda the expectation that mods use these to refactor their code and changing things up.

    IC2C for example did undergo between 1.7.10-1.10.2/1.12.2 a whole rewrite from scratch.
    Same goes for 1.12-1.19 versions.


    The only thing that has multi version support in ic2c is the reactor planner, which usually even gets backports with new Encoding formatts.


    But I highly suggest you if you want the IC2 Experiece to try the IC2Classic version.
    it has been well tested, is still maintained, and has a lot more QoL features you will most likely love.
    (Including a ingame wiki)