Not quite. In previous versions when you found a hint in the library it would set a variable called like "marbleHint" to true. Then, in the Cave passage, there was a section checking to see if "marbleHint" was true and if it was, it would give you the option to search for some marbles.
Now when you find a hint it instead sets a part of an array to true instead. "hints[marble]" for example. The twine compiler didn't complain about it because the old variable technically still exists it's just no longer used.