You know why Harry Potter is amazing? 99% of fan theories, headcanons and meta could be canon because Harry is about as observant as a brick wall. Did Slytherins come back to fight in the Battle of Hogwarts? Did Draco Malfoy enjoy crossdressing? Was Hermione transgender? Who knows, certainly not Harry
Harry didn’t notice Hermione time traveling around him for a whole year or his own teacher’s hand writing
Harry didn’t notice that he was a wizard
The glass is just gone I don’t know maybe that just happens with snakes sometimes.
harry didnt even notice he was talking with snakes. Like, even tom riddle realized that he was speaking snake at a very young age