Bug Report

I put items into the chest via an Ender pouch/chest and the items show up but when I finished adding more, I lost 70% of everything I had.
Steps to Reproduce (for bugs)

Added items.
Added more items and look into the AE2 System.
Logged of and then on again and I lost stuff again.
Replaced AE2 System with RFTools Storage Scanned and same thing.

Logs

Client/Server Log:
Crash Log:

Client Information

Minecraft Version: 1.12.2
Forge Version: 14.23.5.2775
Modpack Version: Stoneblock Mod Pack 1.0.28
Server/LAN/Single Player: Single Player
Optifine Installed: Yes, HD U E2
Shaders Enabled: No

Added an RFTools Storage Scanner to the chest in place of the AE2 System and it does the same thing. When I place items into the chest via those systems, when I log off and on again the items are deleted.

I made both a 9x9 and a 20x20 wooden chest and in both instances, items are deleted upon logging into the game.
latest(1).log

Never had a problem with that when I was playing Revelation. I installed a mod called Ender Rift that basically allows for infinite storgage...at a power cost. Never had any performance issues with that.

There is nothing we can do when an external inventory decides to not save its contents correctly.

Will see what the maker of CC says.

Also as recommendation these massive inventories hooked to a storage bus can be a major performance issue and there is nothing we can do about it as Forge does not care to improve it anyhow.