Unless I missed something or unless Ore Scrubber's mechanic has changed, it seems Dupes do not use them anymore when carrying contaminated materials (tested with fungal spore, slime and clay).
Thanks in advance.
Steps to Reproduce
Load the attached save file (Dracian1.sav). Ore Scrubbers are located at the bottom of the base. Everything is already prepared : a Duplicant will plant a Fungal Spore in the farm tiles right of the Scrubbers and another one will fertilize it with slime. Both will have to cross the way of some Scrubbers (loaded with Chlorine) but none will use them.
Status: Known Issue
We are aware of this issue and have it logged internally but either we do not have a fix ready yet or we are not planning on addressing the issue in the immediate future.