Sources/sinks can't be enabled in sandbox mode

I can toggle every other button in the sandbox panel except the one for the sinks. They are also not working when placed, so its not just a UI glitch in the panel.
I have no mods in use. I attached an earlier save (22.save) from my play through where I can toggle the button. Not sure how I broke it in the meantime. (the saves are not in sandbox mode yet, you'll need to enable it). But with the 29.save I can 100% reproduce it locally.

We are looking into it, looks like it's specific to the save.

This is now fixed in v0.8.4a build 588 on experimental

Thanks for the report and saves, they were helpful

Happy to help and thanks for the quick fix! Just out of curiosity, what did I do to trigger this bug?

this was actually a regression regarding configs, where instead of one config being shared by the entire game, each component had its own config, so what you observed was just a side-effect of much bigger issue.