Importer can't import fluids if target machine have fluid in input slot

[mk0003]

Describe the bug

I am trying to automate GregTech Modern Chemical Reactor but RS only imports fluids when there is no fluid in the input slots:

Autocrafting gets stuck because of this.

How can we reproduce this bug or crash?

1. Place a chemical reactor and give it energy (for example steam turbine generator).
2. Put a crafter on it and set recipe for salt water or any recipe that uses any fluid and outputs any fluid.
3. Connect importer to import fluid output.
4. Request at least 2 set of output fluid.
5. You will see until all input fluids used it will not import any fluid from the output side.

What Minecraft version is this happening on?

Minecraft 1.20.1

What Forge version is this happening on?

47.2.23

What Refined Storage version is this happening on?

1.12.4

Relevant log output

https://gist.githubusercontent.com/mk0003/71a0b9a3f49b31ebd529930625f5b253/raw/f2caac81448b7eb9a98fc22085755f8a9a40e9a9/latest.log

[mk0003]

I tried other fluid transfer methods to see if it is a GregTech Modern issue and EnderIO, Applied Energistics and Pipez mods able to transfer fluid even if there is an input fluid. So looks like this is a Refined Storage bug to me.