Fortunately, you are right. I played after a long period of not playing, and didn't remember some tech requirements were shown in the upper right corner of the tech icon.
I had a weird issue when choosing what to research: when I tried to research machinery or some such, it researched pottery instead, even though I'm certain I should have been able to research it. No matter what I did, it tried to research some earlier thing instead.
Perhaps that has been...
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