so, im getting command blocks generating whenever i try to recreate the nether dimension, im in survival mode, and have tried multiple worlds, usually its command blocks, but sometimes its other blocks like carpet. i have NO IDEA what is happening. here are the FML details from a crash report, it is unrelated, just used the details for a breakdown of my setup.
zed->Post-initialized->Available->Available->Available->Availableasielibcore{} [AsieLib CoreMod] (minecraft.jar) Unloaded->DisabledAE2 Version: beta rv0-beta-16 for Forge 10.12.0.1024Mantle Environment: Environment healthy.TConstruct Environment: Environment healthy.AE2 Integration: RotaryCraft:OFF, IC2:ON, RC:ON, BC:ON, MJ5:ON, MJ6:ON, RF:ON, InvTweaks:OFF, MFR:OFF, DSU:ON, FZ:OFF, Waila:ON, CLApi:OFF, RB:OFF, InvTweaks:OFF, NEI:ON, CraftGuide:OFF, FMP:ONLaunched Version: 1.7.2-Forge10.12.1.1098LWJGL: 2.9.0OpenGL: AMD Radeon HD 7700 Series GL version 4.2.12430 Compatibility Profile Context 13.152.1.8000, ATI Technologies Inc.Is Modded: Definitely; Client brand changed to 'fml,forge'Type: Client (map_client.txt)Resource Packs: []Current Language: English (US)Profiler Position: N/A (disabled)Vec3 Pool Size: 1735 (97160 bytes; 0 MB) allocated, 66 (3696 bytes; 0 MB) usedAnisotropic Filtering: Off (1)