Not all chests are registering as being opened/collected. Halts 100% completion.

This happened to me too ☹️ had finished the story and then spent half a dozen hours or so cleaning up chests and collectibles, and on the last planet (Ilum) the chest in the shattered lake did not register, but i still have the item from within in. Im sure because i looked online to know wich one it was, and i have the Companero Poncho. And if i go back the chest is open, but still it didnt register. It sucks because thats literally the only thing i have left to do in the game, and im a 100%-er so i need it! Please fix soon!