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One of the most difficult things to master in a foreign language: cases where the target language uses multiple words (subcategories) for a concept for which your previous languages only have one word. You're simply not used to parse reality into these new subcategories.
A simple example would be counters in Japanese. In European languages, a counter is just a number, so you would say, "three birds, three peanuts, three sheets of paper, three pens, three cars". In Japanese, a counter conveys not just quantity but also various object properties
So you would say, sanba (birds and bunnies), sanko (generic small thing), sanmai (flat thing), sanbon (cylindrical thing), sandai (large vehicle), etc. In fact there are more distinct counters than I can count. It takes a long time to get used to these distinctions
There's even a counter specifically for chopsticks. Even though they're cylindrical objects, chopsticks are their own semantic category within cylinder-like things
Also birds and bunnies are a distinct category within animals, so while there's an animal counter, birds and bunnies have their own specific counter. Bunnies are a type of bird 
Or you come from a language that is so rich that you can't properly express yourself in new one... (Turkish to English for example)
How is this different than simply discovering a more nuanced interpretation of a concept that you thought you knew? It seems the foreign language aspect is incidental to that primary learning task.
It’s not just more nuanced; it’s orthogonal. In this case that all flat things should be enumerated deeply and fundamentally together, or all full receptacles. Language contains categorisations that shape our thought, and are generally unacknowledged.
Even more troublesome is when the foreign language makes phonological or tonal distinctions that one's childhood languages don't make.
Hahaha, this! 
«want» vs. «won't» They will always sound the exact same, even though I can reproduce the “different” sounds.
A simple example of this for German natives speaking English is distinguishing “this” from “that” (both generally “das” in German).
I think the case of "the" vs "der, die, das, dem, der, dem, den, die, das, des, der, des" is more well known...
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