Hello,
I updated from the original mod to your newest version (0.7.4) and then I found structures in my "Redstone rdy" test world and I get this crash now:

https://pastebin.com/Hn8fRXYT

First time it crashed, I was on my way to the structures. (after world reload no crash next to the structures, but 🔽)
The second time it crashed, I was on my way back to my test stuff.
(I have no MO stuff placed in my world, only some items in vanilla chests)

MC: 1.12.2
Forge: 2860
MO.CE: 0.7.4
Optifine: Yes

• 225 other mods (IE / EIO / AE2 / &&&)

Ps: on curse forge I wrote a comment about Tritanium ore and JAOPCA integration.

Is it maybe this ?

(I swapped back the version)

Edit: also now the same crash with the old original version.

not sure how u have done this i havent been able to replicate? also not sure why u have missing textures?

In your version, you fixed structure spawn. In my play world I found never MO structures (created with the original version), so I could never have this crash.

Something in the structures must create this crash.
(the missing textures blocks are maybe because I swapped back to the old version)

Well that save is 1.13....

Test Flat-20220125-043332.zip

This is my test world, use any tech based modpack with around ~227 mods. (my modpack is not on curse)
In one of the 4 directions are the MO structures.

No, it's not.
Just forgot to write, that the test pack must contain the more IDs mod. (just enough ids (correct name in the mod list in the crash log, but I am not using the newest Version from the ID mod, because mixing problems)

I am back in -7 hours, it is already late.

no matter what i try i cant reproduce this and because the save file you have sent is not even for 1.12.2 im closing this

It is okay, if you can't reproduce it, BUT IT IS NOT A 1.13+ WORLD!

Look at the picture, dim-6 / dim-12 are Aroma mining world and sphere world files, there is no Aroma mod in any newer versions.
Same with Aether 2 and in "data" are more files from mods only in 1.12.2 ...

Maybe JustEnoughIDs change something in the file structure to emulate newer version code, but it is 1.12.2 ...

do you have a link to download your modpack?

I don't have the pack in Curse, here is a link to the mods / configs / scripts:

https://drive.google.com/file/d/1b4g8G5HqWSVb6-S0Zqx2TNhM1kc2FQp4/view?usp=sharing
(aether is not longer installed, because the mod is rly ... not finished.)

In this version is the original version of MO installed, you can test it with this version and then with your version.
Just start it with Forge 2860.

MatterOverdrive-1.12.2-0.8.0-universal.zip

Could you try this if u still have the crashing world? you will need to extract the jar from the zip

Yes, I try it.

I can fly around without crashes and I can load new structures without crashes.
(and no missing texture textures anymore)

It looks like you fixed it. :D

Good job 👍

!!!! yay