Unless some requirements have changed, the Thermal Evaporation Tank is not producing Lithium. Brine fills up on the left, but never lithium on the right. I can take the same setup, remove the brine from it and pump water into it instead and it immediately starts to produces brine.

Please use the search functionality when reporting issues.
There's an issue open for the exact same issue.

#4425 and #4426 with an open pull request to fix the issue. (don't know why I mentioned these...)
#4406 and #4410 with a merged pull request to fix the issue