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I have found the cause of the problem.
First I tried to remove all the work properties in overview, except for the cleaning. Everybody immediately started to work. Than I added the constructing back to everybody, and they stopped again. So construction makes everybody stuck.
I looked around, and I found the problematic place. There was a wall planned, but there was a metal stuck there too. So as soon as I sold one of the walls, and made the metal accessible, every body went back to normal.
I attached an image showing the problematic place.

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Same thing happened to me, same build, but at day 73. They eat, go to sleep, I can force them to do stuff, they do it, than do nothing. They have plenty of jobs.
Problematic save attached, compressed in 7zip.

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