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Just FYI on my specific problem: I realised a second time that after the siphon it's the harvesters that are next able to plop down. It's when you escape out of placing the harvesters before placing them, however, you get that situation where nothing is clickable.

Hmm. Someone on Steam said the hotkey for construction remains active. I haven't tried it yet, but the dev said they're looking into the issue.

Yup! Fixed!

Thanks again!