[PvK]

There are two reasons (in Proportions, not sure about Derek's) for not getting tech from ruins.

One is that you already knew the tech you discovered.

In Proportions mod, there is the added chance that the ruins actually didn't have anything useful enough to give you a sudden tech boost. The Proportions planet types include a lot more ruins or things that look like ruins, but actually won't give you anything. This way, you have to explore to find out if you'll actually get something or not, which adds uncertainty and makes sense. I don't know if Derek kept this in his Version of the planets file, or not.

PvK