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Cell workbench dupes upgrade cards and gives very glitchy behaviour #3776

incomingnerd opened this Issue Oct 13, 2018 · 3 comments


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incomingnerd commented Oct 13, 2018

Describe the bug
The Cell Workbench can duplicate and destroy upgrade cards such as the Inverter Card and Fuzzy Card. It also leaves manipulated cells in an inconsistent state, filtering as if they had upgrades when they don't and vice versa.

This might be an issue with how and when the workbench writes back upgrade card information to the cells, as different results can be had by opening and closing the workbench UI at various points while manipulating the cards.

To Reproduce
For a visual guide, see here:

Note: Don't close the Cell Workbench UI unless stated - this alters the results

  1. Create a Cell Workbench, two Cells and a single Inverter Card
  2. Insert the first Cell into the Cell Workbench
  3. Insert the Inverter Card into an upgrade slot
  4. Remove the first Cell
  5. Insert the second Cell
  6. Remove the errant Inverter Card from the upgrade slot
  7. Close the Cell Workbench UI and re-open it
  8. Remove the second Cell
  9. Insert the first Cell
  10. Close the Cell Workbench UI and re-open it
  11. Remove your free gift from the upgrade slot!


  • Single player

  • Fresh installation from Twitch launcher

  • Only AE2 installed

  • Minecraft Version: 1.12.2

  • AE2 Version: appliedenergistics2-rv6-stable-2

  • Forge Version: forge-

I discovered the bug in the FTB Direwolf20 1.12 modpack (appliedenergistics2-rv5-stable-11) when using View Cells to filter my storage system. I've verified it is still present using the latest version of AE2 and Forge at the time of writing.


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mixilester009 commented Nov 5, 2018

Provide screenshots to better understand the situation.


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incomingnerd commented Nov 6, 2018

See the album here:


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incomingnerd commented Nov 6, 2018

Note: I've only illustrated the dupe bug, but the buggy behaviour also leaves the two cells in a weird state - they may or may not have inverted filtering, depending on the order of operations.

yueh added a commit that referenced this issue Dec 24, 2018

@yueh yueh added the type-bug label Dec 24, 2018

@yueh yueh closed this in 33bc0a6 Dec 24, 2018

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