Is there an existing issue for this?

• I did not find any existing issues.

Current Behavior

If a stack(of 2 or more) of fluid containers that are stackable when filled, such as Tinkers' Construct copper cans, seared tanks or Thermal Series Florbs is inserted into an EnderIO Fluid tank with sufficient fluid inside,
only the amount needed to fill one container is extracted, but ALL of the containers receive that amount, duplicating the fluid by the stack size.

Industrial Foregoing currently has the same issue, AE2 and TiC smelteries do not have this issue.

I will report this bug to all affected mods.

EnderIO 6.2.11-beta on 20.1

Expected Behavior

I expected the UI to either block, only fill one container at a time or extract an appropriate amount of fluid from the tank when trying to fill multiple stacked containers in the Tank UI.

How to Test

1. Get a stack of at least 2 stackable fluid containers, i.e. TiC Copper Cans or Seared Tanks or Thermal Florbs.
2. Fill EnderIO (Or Industrial Foregoing) fluid tank with some fluid.
3. Fill the stack of containers using the other mod's tank UI, i.e. clicking the IF tank or placing the stack of containers in the retrieval slot in the EIO tank.
4. The max amount of fluid that can fit into ONE container is retrieved from the tank, but ALL containers receive that amount, effectively duplicating the fluid by the number of tanks.

Local Environment

- **Operating System**: 
- **Java version**: 
- **Minecraft Version**: 
- **Version**: 
- **Other Mods**: Applied Energistics 2, Mekanism...

Any Additional Information?

No response

I regret to say that we no longer officially support Minecraft 1.20.1 - as such we will not be officially fixing this issue.

If any community member wishes to submit a pull request to address this issue, feel free to open a PR and we will review and merge it.

I will close outstanding 1.20.1 issues in a little while, to keep the issue list clear.

Thanks again for your report.