It's rare after a point, but it does and has happened. The Chinese industrial revolution circa 1000 was completely reversed, we don't know what Corinthian Bronze actually is, Damascus Steel is a lost art only recently (and only barely) recovered, and all attempts at figuring out how to make Greek Fire have failed. Having a technology rich history generation that can't include such tragedies as the destruction of the libraries of Alexandria and Baghdad, for example, would be a notable absence I think.
Thats not true at al. Damascus Steel was an iron ore found in northern India. It stopped, not because anything was lost but because the deposits ran out. There is no need to place techniques on it.
Corinthian Bronze was probably an alloy of copper and gold or silver or high quality bronze. Though we don't know what it was, because there no known example of it. There is no need to place techniques on it.
Greek Fire, maybe the only actually lost thing here. Though napalm is is probably more effective version of it. Greek Fire is really interesting, as its one of the earliest if not the first example of compartmentalization in order to secure state secrets.
And Alexandria didnt exclusively have originals nor did Baghdad. So while the several destruction of the Alexandria library did lose some knowledge, probably not as much as romantically believed.
And roman underwater concrete is awesome. But it wasn't ever lost. Concrete was used well after the roman era. It also wasnt superior to modern concrete. So while there are lots of roman concrete left, roman over engineered. And most of Roman concrete isn't around. The issue here, is how that knowledge was preserved. It was mostly passed on in master apprentice relationships, and whose recipe change over time, with new knowledge, new needs and probably most important, what you have on hand. The quote unquote rediscovery of underwater concrete to redo the parisian sewers, was done to avoid unions. If the state could figure out how to do it, they didnt need to rely on union workers to do the work.