Versions:
-Minecraft Forge: 14.23.5.2854
-Industrial Renewal: 0.21.4

What happens:

Crash or strange behavior, when you place multiblocks from 0.20 and 0.21 like storage rack, place another on top, brake bottom one... that's it, tank and battery bank disappear content, storage rack cause crash

What should happen:

works I think, or maybe not crash at least please

I'm huge fan of your mod and appreciate your hard job...

Can you send the crash log?

Sure, I have actually two different:

java.util.concurrent.ExecutionException: java.lang.IndexOutOfBoundsException: Index: 225, Size: 135
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at net.minecraft.util.Util.runTask(SourceFile:531)
at net.minecraft.client.Minecraft.runGameLoop(Minecraft.java:1088)
at net.minecraft.client.Minecraft.run(Minecraft.java:3942)
at net.minecraft.client.main.Main.main(SourceFile:123)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:497)
at net.minecraft.launchwrapper.Launch.launch(Launch.java:135)
at net.minecraft.launchwrapper.Launch.main(Launch.java:28)
Caused by: java.lang.IndexOutOfBoundsException: Index: 225, Size: 135
at java.util.ArrayList.rangeCheck(ArrayList.java:653)
at java.util.ArrayList.get(ArrayList.java:429)
at net.minecraft.inventory.Container.getSlot(Container.java:120)
at net.minecraft.inventory.Container.putStackInSlot(Container.java:519)
at net.minecraft.client.network.NetHandlerPlayClient.handleSetSlot(NetHandlerPlayClient.java:1154)
at net.minecraft.network.play.server.SPacketSetSlot.processPacket(SourceFile:30)
at net.minecraft.network.play.server.SPacketSetSlot.processPacket(SourceFile:10)
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at net.minecraft.util.Util.runTask(SourceFile:529)
... 9 more

and

java.util.concurrent.ExecutionException: java.lang.NullPointerException
at java.util.concurrent.FutureTask.report(FutureTask.java:122)
at java.util.concurrent.FutureTask.get(FutureTask.java:192)
at net.minecraft.util.Util.runTask(SourceFile:531)
at net.minecraft.server.MinecraftServer.updateTimeLightAndEntities(MinecraftServer.java:723)
at net.minecraft.server.MinecraftServer.tick(MinecraftServer.java:668)
at net.minecraft.server.integrated.IntegratedServer.tick(IntegratedServer.java:185)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:526)
at java.lang.Thread.run(Thread.java:745)
Caused by: java.lang.NullPointerException
at cassiokf.industrialrenewal.gui.container.ContainerStorageChest.(ContainerStorageChest.java:13)
at cassiokf.industrialrenewal.init.GUIHandler.getServerGuiElement(GUIHandler.java:92)
at net.minecraftforge.fml.common.network.NetworkRegistry.getRemoteGuiContainer(NetworkRegistry.java:253)
at net.minecraftforge.fml.common.network.internal.FMLNetworkHandler.openGui(FMLNetworkHandler.java:88)
at net.minecraft.entity.player.EntityPlayer.openGui(EntityPlayer.java:2550)
at cassiokf.industrialrenewal.tileentity.TEStorageChest.openGui(TEStorageChest.java:74)
at cassiokf.industrialrenewal.blocks.BlockStorageChest.onBlockActivated(BlockStorageChest.java:34)
at net.minecraft.server.management.PlayerInteractionManager.processRightClickBlock(PlayerInteractionManager.java:449)
at net.minecraft.network.NetHandlerPlayServer.processTryUseItemOnBlock(NetHandlerPlayServer.java:741)
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(SourceFile:55)
at net.minecraft.network.play.client.CPacketPlayerTryUseItemOnBlock.processPacket(SourceFile:11)
at net.minecraft.network.PacketThreadUtil$1.run(SourceFile:13)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at net.minecraft.util.Util.runTask(SourceFile:529)
... 5 more